2024 Allison transmission problems

Is an Allison transmission giving you problems? Here’s what may be happening and how to attempt fixing it before calling in for a professional.. All gang hideouts rdr2

Do you know how to test a torque converter? Find out how to test a torque converter in this article from HowStuffWorks. Advertisement Your car's transmission is having some problem...75 posts · Joined 2010. #1 · Jun 18, 2010. Hey guys, new to the forum here. Had a quick question. Today on the way home from work I got on it kinda hard and at about 60mph it felt like the trans was slipping. The rpm would keep increasing but the truck would not accelerate for a split second. Then when I had come to the next stop about 8 ...One thing you can try (assuming you are talking about the 2-1 downshift) is use the throttle and the brake as you are coming to a stop. Slightly raise the engine RPM as you are coming to a stop. This procedure will essentially "teach" the transmission how to downshift.Nick and Joey give us a basic run down of the Allison 1000 Transmission. They also discuss common questions received by many customers and enthusiasts. Die... Here’s what you need to know about Freightliner Allison transmission problems. The first thing to know is that there are two different types of Allison transmissions – the 1000 series and the 2000 series. The 1000 series is older and has been known to have more problems than the 2000 series. Here’s what you need to know about Freightliner Allison transmission problems. The first thing to know is that there are two different types of Allison transmissions – the 1000 series and the 2000 series. The 1000 series is older and has been known to have more problems than the 2000 series. Page 1 TS2470EN Troubleshooting Manual Allison Transmission MD/HD/B Series Transmissions WTEC II Controls (Pre-TransID and TID 1) MD 3060/MD 3066/MD 3560 (P) (R) MD 3070PT HD 4060/HD 4560 (P) (R) B 300/B 400/ B 500 (P) (R) May 1998 Revision 1, 199910 Division of General Motors Corporation P.O. Box 894 Indianapolis, Indiana …2011 Allison Transmission Problems. Hi, this is my first post and I could really use the help. I have a 2011 Silverado 2500 HD. 2 weeks ago I got in the truck to shift into reverse and it came up shift inhibited. It wouldn't shift into any gear. After playing with the linkage and anything else I could get my hands on I got back in the truck and ...Aug 2, 2018 · One thing you can try (assuming you are talking about the 2-1 downshift) is use the throttle and the brake as you are coming to a stop. Slightly raise the engine RPM as you are coming to a stop. This procedure will essentially "teach" the transmission how to downshift. Active member ... It was the "trimmer valve". If anyone else experiences the same issues, this is probably the culprit. I pulled the valve body and with the help ...The Allison MT643 transmission is a reliable component in heavy machinery, but it’s not immune to problems. Issues like overheating, slippage, and mechanical failures can be mitigated with regular maintenance and professional oversight. Using the correct fluid and replacing filters as recommended are key steps in …2021 2500 GMC Duramax Black Diamond edition 10 Speed Trans Failure, Leaking fluid out of tortue converter cover & low On fluid & cannot fill trans. Owed many Later model GMC HD trucks. No reason GMC built a trk that you cannot service or fill the trans. Dealer will have to tow. Save Share.Common transmission problems include transmission fluid leaks, worn or damaged torque converters, solenoid damage and clutch problems. Low fluid levels or an improper transmission ...Allison 1000 Series NSBU Switch pictures from cars photos on webshots. I replaced the switch, the problem was solved. It costs approx $280 - alot cheaper than a new tranny! Replacement instructions came with the switch kit, easy to follow and only two plugs, two bolts and the linkage arm to disconnect. Cheers guys! :drink.It will be built in-house by General Motors and simply features Allison branding. The transmission isn’t closely related to the 10-speed automatic found in the 2019 Silverado 1500, as far as we ...the 10L1000 is the gm/Allison trans which is in the 2500+ l5p trucks. the 10L80 is the gm/ford 10speed in the light duty 1500 series trucks which are only similar because they …Warranty coverage and relevant maintenance information for each transmission can be found here using the transmission serial number. Repair Assistance Technical Support …Allison Transmission is a renowned manufacturer of commercial duty automatic transmissions. However, some models of the Mt653 transmission have been known to have issues. Common problems with Allison Mt653 include hard shifting, delayed engagement, and premature failures.1814 posts · Joined 2021. #11 · Apr 11, 2022. the 10L1000 is the gm/Allison trans which is in the 2500+ l5p trucks. the 10L80 is the gm/ford 10speed in the light duty 1500 series trucks which are only similar because they are both 10 speed. there were early issues with the 10L80 but seem to have been resolved in 2021+ Vehicles. I have two ... These solutions involve identifying the root cause of the problem and implementing fixes that address the specific issues. 1. Regular Maintenance and Inspection: One of the most effective solutions for internal wiring harness problems is to perform regular maintenance and inspection of the transmission. This involves checking for any signs of ... Allison Transmissions. How To Check & Clear Trouble Codes Without A Scan Tool. In this video I have a Heavy duty truck with an Allison automatic transmission...When it comes to solving internal wiring harness problems in Allison transmissions, there are a few key solutions that can help improve the overall functionality and reliability of the transmission. These solutions involve identifying the root cause of the problem and implementing fixes that address the specific issues. 1. Regular Maintenance ... These solutions involve identifying the root cause of the problem and implementing fixes that address the specific issues. 1. Regular Maintenance and Inspection: One of the most effective solutions for internal wiring harness problems is to perform regular maintenance and inspection of the transmission. This involves checking for any signs of ... Jun 9, 2021 · Make sure that all the vacuum lines and parts are in the right position and connected. Installing back in any pipes that were disconnected or loose should most likely fix the issue you were getting on your transmission system. TCM Module Issue. The Allison Transmission 1000 is an amazing system that comes with tons of features. cdh7917. 348 posts · Joined 2017. #7 · Sep 10, 2019. Count me in the same group as the others. The 10 speed has been great to drive with. And mine is still learning, so it's getting better and better each time. Shifts are hardly noticeable and it's smooth as silk! 2021 GMC Sierra 3500 AT4HD. Save Share.May 24, 2018 ... Allison 3000 automatic transmission stuck in first gear. See the full write up here http://www.mechanicshub.com/toolbox/allison-auto/.3 Common Allison Transmission Problems Copeland International. Ford Mustang 2 3 Ecoboost Engine Swap Wiring Harness And Ecu Kit Convert Loom Ant Steering Electronics Bruno. Allison Hd 4060 Code D 1 00 35 Irv2 Forums. Allison Transmission 24 Volt Control Valve Wiring Harness 29543334 Sel Dash. Allison …Mar 4, 2017 ... ... Allison Automatic that is having some shifting problems. It has a code P0700 stored in the PCM. It also has a code P0773 Shift Solenoid E ...Allison Transmission Forum - A forum for discussion of the Allison Transmission as related to RV usage. ... When "Malfunction Indicator Light" is NOT a trans problem. Rcdukes. 12-29-2023 05:29 PM by Rcdukes. 5: 950 : Allison 3000 speed sensor issues. Samsquatch. 12-27-2023 08:42 PM by Skip426. 7: 1,892 :History + Heritage. Throughout our long history, Allison Transmission has been a leader in innovation, creativity and continually pushing toward new advances in technology. Our heritage, starting in 1915 with James Allison, has been strong and steady throughout the decades that we’ve been creating fully automatic transmissions.cowdoc. 1183 posts · Joined 2004. #16 · Mar 27, 2015. Valve body will need to be replaced. The Dealership that replaced the solenoid was instructed by GM to replace the valve body, but they didn't. 2018 CC SWB Sierra SLE 2500HD Z71. Banks Deringer and CAI. CP4 failure: 2015 GMC Denali SRW 3500HD 4x4.http://www.patreon.com/JaxAustin | Shop my Amazon Store: https://www.amazon.com/shop/jaxaustin Vlog #510: Richard + Christian at Arizona Transmission + Engi...No problems till 165,000 miles when I got big tunes and torched the converter. Otherwise, the NSBU switches are shit if not updated, but thats not a big deal, and not really just an 01-02 problem. 2002 CCSB 4x4 LT. Dark charcoal exterior/black leather interior. 20x9 Death Metal Novakanes. 33 12.50 20 MT's.Rvn4me. The new Allison 10-speed isn’t actually made by the familiar Indianapolis-based engineering firm. It will be built in-house by General Motors and simply features Allison branding. General Motors describing the Allison-branded unit as “all-new.”. Mike L. Always reported on what was improved on the Allison & Torque …Allison transmission problems. D1 is the first of 5 stored code positions, D1-D5. Codes are total of 4 digits (2 digits main and 2 digits sub codes) Display will cycle thru all 3 positions automatically. If no stored code it will display D1, - -, - -. If theres a code on D1 the - - will be the code.But issues can occur, as we discuss. The Allison 10L1000 10-speed transmission is the heavy-duty automatic for Chevy Silverado and GMC Sierra HD trucks. That means it is a stout, though complex transmission, able to take the added burden the Duramax diesel engine puts out. It has the highest relative torque capacity of any full-size truck made.If your transmission fluid is low, the transmission may not be able to shift correctly. Plus, you can see and smell the fluid to tell if it is burnt. Add fluid to the correct level if low. Figure 3. Check your transmission fluid dipstick. If fluid level is acceptable, move on to Step 5. If fluid is burnt proceed to Step 4.Allison Transmission (NYSE: ALSN) is a leading designer and manufacturer of vehicle propulsion solutions for commercial and defense vehicles, the largest global manufacturer of medium- and heavy-duty fully automatic transmissions, and a leader in electrified propulsion systems that Improve the Way the World Works.It's the nature of the Ford 10spd "Allison branded in Name Only" transmission. TFLTrucks noted that the L5P went from the best mileage of the big three in 2019 to the worst MPG in the 2020 model year. The only change was replacing the 6spd Allison with the 10spd 10L1000 Ford trans. Too bad to. Allison had a 9spd set to go …The following signs may apply to all transmission models and brands and are not limited to just the Allison 3000 or other Allison models. 1. Strange noises coming from the engine or transmission- this happens often and you may hear humming, grinding, whining, and buzzing. The repair will depend on what is wrong. 2.The pressure manifold switch and the NSBU work together and verify each other so codes P840-P876 and P1709-P1714 which are pressure manifold codes, can also point to a faulty NSBU. If all looks well and you’ve checked the simple things like power and grounds, the battery etc. then STOP, and try this next. Keep a new NSBU handy as a …Limped it to the Allison Transmission shop and they looked at it, charged me $400.00 to tell me to take it to GM Dealership, for electrical diagnostics., as while they had it it will no longer send codes to the OBD ... Replaced the ignition switch, and cured the problem so far (16000 miles). 2004 LB7 - FASS 150 & CAT Fuel Filter 120k miles ...Feb 10, 2010 ... My father just bought an '02 2500 4x4 with the 8.1 and the allison transmission, it was delivered today from florida. The problem is that ...3 Common Allison Transmission Problems Copeland International. Ford Mustang 2 3 Ecoboost Engine Swap Wiring Harness And Ecu Kit Convert Loom Ant Steering Electronics Bruno. Allison Hd 4060 Code D 1 00 35 Irv2 Forums. Allison Transmission 24 Volt Control Valve Wiring Harness 29543334 Sel Dash. Allison …5. Torque Converter Issues. The torque converter is the unsung hero of your Allison 6 Speed Transmission. When it malfunctions, you could be looking at symptoms like shuddering, slipping, or high RPMs without an increase in speed. These problems are often complex and require professional attention. 5. Torque Converter Issues. The torque converter is the unsung hero of your Allison 6 Speed Transmission. When it malfunctions, you could be looking at symptoms like shuddering, slipping, or high RPMs without an increase in speed. These problems are often complex and require professional attention. When it comes to solving internal wiring harness problems in Allison transmissions, there are a few key solutions that can help improve the overall functionality and reliability of the transmission. These solutions involve identifying the root cause of the problem and implementing fixes that address the specific issues. 1. Regular Maintenance ...The Allison VIM is marked Allison and only has a single cover. Be sure to check the fuse directly at the batteries first they are very bad about popping,or they could have left the power or ground wire off at the batteries which would kill the power to the Allison controls. Bill. Allisonforeman, Transmission foreman. Category: Heavy Equipment.Allison transmission problems. D1 is the first of 5 stored code positions, D1-D5. Codes are total of 4 digits (2 digits main and 2 digits sub codes) Display will cycle thru all 3 positions automatically. If no stored code it will display D1, - -, - -. If theres a code on D1 the - - will be the code.Any problems with this will most likely stop your vehicle from moving and might even damage other parts. Allison Transmission . Allison Transmission is a famous American company that mainly focuses on transmission systems. They have a huge lineup of devices that you can purchase which come with numerous features.One thing you can try (assuming you are talking about the 2-1 downshift) is use the throttle and the brake as you are coming to a stop. Slightly raise the engine RPM as you are coming to a stop. This procedure will essentially "teach" the transmission how to downshift.Allison 6 Speed Transmission Problems Any modern vehicle can run at a controlled velocity because of these three main components—the engine, the transmission system, and the drivetrain. The transmission system is essentially part of the drivetrain, but when examining a vehicle’s mechanism and fixing speed-related issues, you must treat it ...Jun 9, 2021 · Make sure that all the vacuum lines and parts are in the right position and connected. Installing back in any pipes that were disconnected or loose should most likely fix the issue you were getting on your transmission system. TCM Module Issue. The Allison Transmission 1000 is an amazing system that comes with tons of features. What are manual transmission synchronizers? Visit HowStuffWorks.com to learn more about manual transmission synchronizers. Advertisement When you shift gears in your manual-transmi...The transmission options that were available to the 2005 Silverado were as follows: MG5 – This is the NV3500 manual transmission. It is the only manual available for the 2005 Silverado. M32 – This will be the 4L65E transmission, which is an upgraded version of the 4L60E. M30 – This is the 4L60E automatic transmission.Allison Transmission Internal Wiring Harness Problems . If you own an Allison Transmission-equipped vehicle, you may have experienced problems with the internal wiring harness. The most common symptom is a check engine light, followed by transmission shifting issues. If your vehicle has been experiencing these problems, it’s …Replace the Worn Parts: Some symptoms of bad transmission such as late engagement or rough shifting indicate transmission problems.Diagnose the faulty parts and replace them. Check Fluid Levels: It is the duty of a truck owner to check the fluid levels on regular basis.A correct fluid level is very important for Allison 10-speed transmission’s smooth …1. Transmission Fluid. The hard shifting problem is often linked with low transmission fluid levels. Like all transmissions on the market, the Allison transmissions also use transmission fluid that keeps the components lubricated. In addition to that, it also minimizes friction between the moving components of the transmission system.The GMC Sierra 3500 HD was GMC’s answer to the heavy duty pickups from Ford, Dodge and Chevrolet. Early versions were equipped with the 4L80E transmission, and the 6L90 6-speed in later models. The GMC Sierra 3500HD 6.6L Duramax Diesel got the Allison 1000 transmission. But they aren’t without their problems though, so let’s look at some …Signs of GM Allison 10-Speed Transmission Problems. There are many different signs of transmission problems, all of which are important to be aware of — a defective transmission can put the car’s driver and passengers at risk of getting into a car accident. Some of the most common transmission problems GM drivers reported include:These solutions involve identifying the root cause of the problem and implementing fixes that address the specific issues. 1. Regular Maintenance and Inspection: One of the most effective solutions for internal wiring harness problems is to perform regular maintenance and inspection of the transmission. This involves checking for any signs of ...Signs of GM Allison 10-Speed Transmission Problems. There are many different signs of transmission problems, all of which are important to be aware of — a defective transmission can put the car’s driver and passengers at risk of getting into a car accident. Some of the most common transmission problems GM drivers reported include:4. Reading on Forum says "snake eyes" on shift panel indicates a "communication" problem between transmission and Allison panel or ECU. I have done absolutely nothing to disturb the wiring anywhere around the Allison ECU or the transmission. I crawled under the coach and looked at all the trans connectors - they …75 posts · Joined 2010. #1 · Jun 18, 2010. Hey guys, new to the forum here. Had a quick question. Today on the way home from work I got on it kinda hard and at about 60mph it felt like the trans was slipping. The rpm would keep increasing but the truck would not accelerate for a split second. Then when I had come to the next stop about 8 ...Mar 4, 2017 ... ... Allison Automatic that is having some shifting problems. It has a code P0700 stored in the PCM. It also has a code P0773 Shift Solenoid E ...To ensure an accurate check, operate the transmission until the sump fluid temperature is 160–200°F (71–93°C) or converter-out temperature is 180–220°F (82–104°C). Park the vehicle on a level surface and shift to N (Neutral). Set the parking brake and/or emergency brakes and chock the vehicle wheels.Some of the more common problems include but are not limited to the following issues- abnormal shifts, abnormal stall check speeds, slipping of the clutch, and abnormal …transmission fluid levels, read diagnostic codes and prognostic information . This manual will help you understand shift selector readouts and enjoy long operation of your Allison Automatic . Diagnostics The Transmission Control Module (TCM) of your Allison Automatic monitors the transmission’s electronic controls; and when a problem ...U0101. The U0101 code is associated with lost communication between the Transmission Control Module (TCM) and other system components. This can result in various transmission issues, including limp mode and gear shifting problems. Some potential causes for this code can include wiring problems, a faulty TCM, or even other …Mar 10, 2010 ... it has 2 lights on it, one light will go out on the left side. the right side will stay on whatever gear it was in. if its sitting still you ...Allison transmission problems. Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. I have a 2000 Allegro Bay 5.9 cummins with a Allison Transmission. We just bought this and on our first trip two miles from the house the transmission went into shift inhibit mode and will only go into reverse.Warranty coverage and relevant maintenance information for each transmission can be found here using the transmission serial number. Repair Assistance Technical Support …Mar 21, 2020 ... 2009 2500HD Allison Transmission Problem Pt. 2. 1.1K views · 4 years ago ...more. Phillip Bailey. 20.9K. Subscribe.5. Torque Converter Issues. The torque converter is the unsung hero of your Allison 6 Speed Transmission. When it malfunctions, you could be looking at symptoms like shuddering, slipping, or high RPMs without an increase in speed. These problems are often complex and require professional attention.Feb 9, 2021 ... Allison 2000 transmission problem. 3.2K views · 3 years ago #truck_diagnostic ...more. Truck Diagnostic. 2.93K.Here are 6 shift selector problems most Allison transmissions come with: 1. Delayed shifting- the source for this issue is twofold. One, there is a problem with the air intake. …3. The TSB: Ram released a TSB to their dealer network on 1/11/2023 which covers this failure. The TSB is # 21-002-23 "K1 Clutch Snap Ring Repair". Under the TSB, ALL 2022 and 2023 3500 pickups and cab & chassis trucks, as well as 4500 and 5500 trucks are listed as potential vehicles to experience the failure.To read the single digit code, and the readout may be vertical in your vehicle, you will see D1 13 12. The first two digits are for the position of the code, first , second, third, and so on. The 13 tells you the main code and the 12 will tell you the sub code. In this example the problem is caused by ECU Input Voltage Low.Allison AT 542 Transmission Question. Hello All, This has probably been discussed in the forum before but here goes. The AT 542 is a non lock torque convertor tranmission and is coupled to a Cummins 5.9L 24V engine rated @ 210 hp. I believe that it is possible to do a transmission swap to a lockup torque convertor type tranny such as …This week's episode dives into a new boxed wine startup and how its founders are hoping their product surpasses the category's stigma. Welcome back to Found, where we get the stori...Feb 17, 2023 · February 17, 2023. When an Allison transmission won’t shift into gear, it’s often due to issues such as low or degraded transmission fluid, malfunctioning shift solenoids, a damaged valve body, or electronic control module malfunctions. Addressing these concerns promptly and ensuring regular maintenance can restore your transmission’s ... Junior Member. Join Date: Feb 2012. Location: Debary Florida. Posts: 6. Trans Com Failure update. I had the motor home into Freightliner for the trans com failure. They determined it was the Allison Transmission speed control that failed. Replacement was about 3 grand. Surprised the coach only has 65,000 miles on it.Allison Transmission Internal Wiring Harness Problems . If you own an Allison Transmission-equipped vehicle, you may have experienced problems with the internal wiring harness. The most common symptom is a check engine light, followed by transmission shifting issues. If your vehicle has been experiencing these problems, it’s …Feb 10, 2010 ... My father just bought an '02 2500 4x4 with the 8.1 and the allison transmission, it was delivered today from florida. The problem is that ...1. Transmission Fluid. The hard shifting problem is often linked with low transmission fluid levels. Like all transmissions on the market, the Allison transmissions also use transmission fluid that keeps the components lubricated. In addition to that, it also minimizes friction between the moving components of the …Allison Transmission Internal Wiring Harness Problems . If you own an Allison Transmission-equipped vehicle, you may have experienced problems with the internal wiring harness. The most common symptom is a check engine light, followed by transmission shifting issues. If your vehicle has been experiencing these problems, it’s …Allison Transmissions on GM Trucks from 2006-07 had to get TCM programming modification, according to an official letter from the car manufacturer. ... You should understand there is a problem if ...8359 posts · Joined 2015. #6 · Jun 14, 2023. If various components aren't getting good power or ground (computers, solenoids, whatever), then anything can happen. Diagnosis is what tells you the problem. But it's not cheap to do. 2004 Sierra 3500 dually, 6.0L extended cab, cab&chassis flatbed, upgraded to 4wd.So once you face such a bummer, consult the manufacturer to adjust the size, observe the shift selector’s cable and the overall transmission system. 2. Poor or Low Transmission Oils. Apart from the misalignment issue, delaying in shifting gear is known to be a common issue with your transmission shift selector.In this video, Eli discusses the Allison series transmissions: the AT545, the MD3060, the Allison 2000, and the MT643. These are the most common transmission...

TSB 06-07-30-013 – Shudder in 6th gear – Allison 1000 Transmission. 2006 Chevrolet Silverado 2500HD – 2006 GMC Sierra 2500HD. Problem – Owners may experience a shudder occurs in 6th gear in 4Hi between 46 mph (74 km/h) and 49 mph (79 km/h). Solution – Reprogram the TCM with TIS version 6.0 or higher.. Carnival celebration balcony rooms

Active member ... It was the "trimmer valve". If anyone else experiences the same issues, this is probably the culprit. I pulled the valve body and with the help ...Like other components, there 6L90 transmission was plagued with several issues, which is almost the same as the 6L90e transmission problems. So here are common 6L90 transmission problems and ways to fix them. Failure of the reverse gear to engage. A common 6L90 problem is the inability of the reverse gear to engage when selected.Allison 4500 RDS problems do occur, which is why it is important to be aware of these issues and what can be done. Read this post to learn more. ... Generally, Allison transmissions are well-made and custom-designed to meet the heavy demands in various industries. Much of the problem with it is in the part failure, this is why it is …2 Common Pto Problems And Troubleshooting Techniques. 2.1 Overview Of Common Issues Faced With Pto Systems. 2.2 How To Diagnose Pto Problems In Allison Transmissions. 2.3 Troubleshooting Techniques For Resolving PTO Issues. 2.3.1 1. Inspect and clean the PTO unit. 2.3.2 2. Verify power supply.VERY unusual for an Allison to have a mechanical issue. Any sign of contamination in the fluid? A leak in the cooler if located in the radiator ...Allison 6-speed transmission problems include slipping gears and delayed engagement. These problems can lead to serious issues with your vehicle’s performance and safety. Allison 6-speed transmissions are popular in heavy-duty trucks, rvs, and other commercial vehicles due to their reliability, durability, and power.The GMC Sierra 3500 HD was GMC’s answer to the heavy duty pickups from Ford, Dodge and Chevrolet. Early versions were equipped with the 4L80E transmission, and the 6L90 6-speed in later models. The GMC Sierra 3500HD 6.6L Duramax Diesel got the Allison 1000 transmission. But they aren’t without their problems though, so let’s look at some …2019 Silverado 2500Hd duramax/allison combo trans shift issues. So for my first post i bring to the group an issue ive been fighting the dealership since day 1. The truck has 18,000 miles on it and it doesn't make a difference if im towing, in regen, light footing it or heavy footing it, shift from 3-4 seems like it slips and then clunks into ...Jun 13, 2021 ... Allison Transmission Data Plate Troubleshooting quick Guide. Help a Veteran Owned Business by subscribing!! AM PM Mobile Semi Truck Repair ...In this video I have a look at a 2009 GMC 2500 that is exhibiting some really strange transmission issues. It only seems to act up once the TCM (mounted on r...Allison Transmission Forum - A forum for discussion of the Allison Transmission as related to RV usage. ... When "Malfunction Indicator Light" is NOT a trans problem. Rcdukes. 12-29-2023 05:29 PM by Rcdukes. 5: 950 : Allison 3000 speed sensor issues. Samsquatch. 12-27-2023 08:42 PM by Skip426. 7: 1,892 :Limped it to the Allison Transmission shop and they looked at it, charged me $400.00 to tell me to take it to GM Dealership, for electrical diagnostics., as while they had it it will no longer send codes to the OBD ... Replaced the ignition switch, and cured the problem so far (16000 miles). 2004 LB7 - FASS 150 & CAT Fuel Filter 120k miles ....

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