Automatic Transmission Control Module Problems of GMC Sierra 1500

The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving uphill, the vehicle unexpectedly lost motive power. There was no warning light illuminated. The vehicle failed to restart and was towed to the dealer, where it was diagnosed, and determined that the engine block had failed and needed to be replaced. The vehicle was repaired. The contact stated that later, while driving at an undisclosed speed, the vehicle failed to shift into gear properly and jerked abnormally. There was no warning light illuminated. The vehicle was returned to the dealer and was diagnosed with transmission failure, requiring the pcm/tcm to be reprogrammed. The vehicle was repaired. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated, and the vehicle was taken back to the dealer, where it was diagnosed and determined that the fuel injector and coolant pump had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure, and a case was opened. The approximate failure mileage was 57,000.

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1) component/system & availability for inspection transmission control system. When shifting into reverse, the check engine lamp flashed and a “transmission service” warning appeared. Dealer retrieved dtc p07b4 and documented: “diagnosis of engine/check engine lamp - customer states when shifting in reverse check engine light came on flashing and warning message on for transmission service. Check and advise. Note: customer does not feel any issue when driving. Savi code p07b4. ” the component remains installed and is available for inspection upon request. 2) safety risk a transmission control malfunction can lead to unpredictable shifting or loss of propulsion, posing risk during reversing, crossing traffic, or merging. 3) reproduced/confirmed by dealer? yes. Dealer confirmed the condition and stored code p07b4 consistent with my report. 4) inspected by others? inspected by an authorized gm dealer. No inspections by police/insurance/others. 5) warning lamps/messages & onset yes. The check engine lamp began flashing immediately when shifting into reverse, with a “transmission service” message. I did not feel drivability issues at that moment. Addendum — link to gm safety recall n242454440 gm safety recall n242454440 addresses excess wear of a transmission control valve that degrades hydraulic pressure, causes harsh shifting, and—rarely—momentary rear?wheel lock?up during a downshift. The remedy is a tcm software update that monitors valve performance and detects wear ~10,000 miles before a potential event; if detected, the transmission is limited to 5th gear and warning messages appear. My transmission warnings and dtc indicate a transmission control/pressure concern consistent with the recall subject. I request that NHTSA consider this complaint related to n242454440 and ensure appropriate recall remedy and coverage. (gm service bulletin/stop?delivery and NHTSA filings corroborate these details. ).

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Ecm - engine system code p0700 and tcm - transmission system code u0073. The truck went in to first gear and wouldn't go over 5 mph on the highway. The dealer is saying it can't be replicated but it's happened multiple times to the vehicle in the past week. The truck was taken to the dealership and inspected but they claim nothing is wrong. The check engine light came on as well as the aforementioned codes.

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the transmission unexpectedly hard downshifted. No warning lights were illuminated. The contact stated that the vehicle was hesitating while driving the rest of the drive. The vehicle was taken to the dealer; however, no cause for the failure was found. The dealer performed an 8-speed transmission fluid and filter replacement. The contact stated that the failure persisted. A month later, the contact stated that on a separate occasion, the transmission unexpectedly downshifted. No warning lights were illuminated. The vehicle was taken to the dealer; however, no cause for the failure was found. The contact stated that the failure persisted. The contact stated that a month later while her husband was driving on the freeway at an undisclosed speed, the engine seized and the rear-end locked and threw the driver into the steering wheel even though the seat belt was securely buckled. The contact stated that the transmission was stuck in drive(d), and the vehicle was unable to move forward. The driver shifted into reverse(r) and was able to pull off the freeway. The contact stated that the vehicle was then driven to an empty parking lot and left overnight. The vehicle was then picked up the following day and was driven to the dealer; however, no cause for the failure was found. The contact stated that the failure persisted. The manufacturer was notified of the failure. The contact hired a GMC engineer to inspect the vehicle and informed the engineer that the vehicle needed to be driven a minimum of three days and 300 miles before experiencing the failure. The contact stated that the engineer drove the vehicle for 100 miles. The contact stated that the GMC engineer and one of the employees at the dealer suggested replacing the pcm module because there was no fault code present during the failure. However, the contact was informed that there was no guarantee that replacing the pcm would fix the vehicle. The failure milea.

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The contact owns a 2020 GMC Sierra 1500. The contact stated while driving approximately 40-60 mph, the transmission hesitated while depressing the accelerator pedal. A dealer was contacted. The vehicle was taken to the dealer and was diagnosed with transmission control module (tcm) failure. The contact was informed that the tcm needed to be replaced. The vehicle was not repaired. The contact related the failure to NHTSA campaign number: 24v797000 (power train); however, the VIN was not included in the recall. The manufacturer was notified of the failure and referred the contact to the NHTSA hotline to report the failure. The failure mileage was 75,200.

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The contact owns a 2017 GMC Sierra 1500. While the contact's husband was driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. Additionally, the rpm increased, and the drive signal flashed on and off. The vehicle was driven to the shoulder of the roadway. The vehicle was taken to an independent mechanic where it was diagnosed with transmission control module (tcm) failure. The contact was informed that the transmission control module needed to be replaced. The vehicle was not repaired. The vehicle was towed to the residence. The contact requested a second opinion from another independent mechanic, and it was confirmed as a transmission control module (tcm) failure. The vehicle was not repaired. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to contact the NHTSA hotline to report the failure. The failure mileage was approximately 137,000.

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The contact owns a 2023 GMC Sierra 1500. The contact stated while driving 35-50 mph, the message "service engine soon" was displayed. Additionally, the power train warning light was illuminated. The vehicle was towed to the dealer, where it was diagnosed that the gear shift control module had failed and needed to be replaced; however, the part was not available. The vehicle was then towed to parkway Chevrolet (25500 TX-249, tomball, TX 77375; where the gear shift control module was replaced. Additionally, the contact stated while driving 35-40 mph, the vehicle was sputtering. The contact was unaware of a warning light being illuminated. The vehicle was taken to the dealer, where it was diagnosed and determined that the tcm needed to be updated, and an unknown part needed to be installed for transmission cleaning. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the dealer for assistance. The failure mileage was approximately 21,000.

I purchased my truck (15 GMC sierra z71 4x4) with around 122,000 miles on it. I would be owner #2. Truck ran great. Around 150,000 miles I noticed my truck's transmission start to jerk while accelerating from gear to gear. No engine light ever appeared. Problem stopped. A few days later while dropping my daughter off at school, my truck wouldn't go passed 35 mph. I had to put the shifter in manual and shift to third gear. Other gears would just rev the rpm's to 4 or 5. Since I didn't want to put my family, me and others on the road at risk. I parked my truck and started driving my other vehicle. A few months went by, and my other vehicle had a flat tire, I had to drive my truck to work. On the way home from work, my truck started acting up again, jerking while accelerating. Speedometer would go up however truck didn't move. I had to pull over quickly so I wouldn't be broken down in the traffic lane. I turned the ignition off and waited five minutes and started the truck up. I was able to make it home. At this time the engine soon light came on. I ran my scanner on my truck and code p0700 tcm was the only code showing. I had a GMC dealer look at my truck and stated I would need a new transmission. I have done many months if not almost close to a year of research with results showing that transmission problems just what I was experiencing are a common problem with 2014-2019 chevy and GMC / silverado pickups with transmission 6l80. I dropped my truck off at another transmission shop just yesterday 3/3/24 and the results today were I need a new transmission. Torque converter issues. The shop stated that they repair / rebuild almost three chevy / GMC trucks like my truck a week with the same transmission problem. I still owe on my truck and shouldn't have to pay almost 6k for a transmission that is known to be an issue from the start of factory build. I own many older model gm / chevy vehicles and only had one other issue with one which also had a known recall issue.

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Tcm. Yes it's available for inspection. It failed causing my truck to just lock the brakes up in the middle of the road almost causing an accident. Causing driver and passenger risk of injury.

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First feeling was, I was driving in a parking lot going maybe 5 miles an hour and I felt a vibration in the brake pedal. Pulled onto the main road and approached a stop light when the truck stopped a little hard as I was depressing the brake pedal. As I started pressing on the gas when the light turned green, I was traveling around 35 mph or so, when the truck came to a complete stop in which myself & passenger were slightly thrown forward due to the abrupt stop for no apparent reason. The vehicle in back of me nearly rear ended me due to the abrupt stop the truck did. I immediately contacted the dealer, in which after several days in the shop, the dealer told me that GMC knew about this particular issue but has not issued a recall. The dealer was instructed to replace the transmission control module, due to a malfunction in the tcm that apparently was trying to shut the truck down completely. Therefore causing the truck to stop abruptly with no warning.

The contact owns a 2015 GMC Sierra 1500. The contact stated that while shifting from drive (d) to park(p), the contact heard a loud clunking sound. Additionally, while driving and downshifting the contact heard the loud clunking sound. The contact also stated that while driving at an undisclosed speed, the transmission slipped while shifting from 1st to 2nd gear, and the vehicle failed to immediately accelerate. The contact stated that the failure occurred more during the winter months. The vehicle was taken to the local dealer who reprogrammed the tcm however, the failure persisted. The manufacturer was notified of the failure. The failure mileage was approximately 30,000.

Tl the contact owns a 2015 GMC Sierra 1500. The contact stated that while driving approximately 35-50 mph, the contact noticed a minor shaking coming from the vehicle. The contact took the vehicle to love Buick GMC (736 Saturn pkwy, columbia, SC 29212; (803) 732-6500) who flushed and refilled the transmission fluid however, the failure recurred. The contact returned the vehicle to the same dealer who performed another transmission flush however, the failure persisted. The contact stated that the vehicle drove rough and that the check engine warning light illuminated. The contact used a dtc scanner and retrieved a code related to the transmission control module and temperature sensor. The vehicle was then taken stokes trainor Chevrolet Cadillac Buick GMC (2004 wilson rd, newberry, SC 29108; (803) 792-4763) and the contact was informed that the internal wiring harness needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the issue and informed the contact that the VIN was included in a special coverage program. The approximate failure mileage was 75,000.

Transmission delay from park to drive. As transmission moves into drive the truck jerks forward violently. Park to reverse did not seem to be a problem. Dealer worked on the truck for approximately 8 hours, flushed transmission, and performed oil change, did not notice any metal in the transmission fluid and sought an update for the tcm (was up-to-date); however, a small amount of water was seen in the oil pan. Dealer performed a test drive and the truck appeared to be back in working condition. Owner attempted to drive the truck out of the dealer lot but the transmission would not engage. Owner attempted to put the truck in reverse, the transmission would not engage. Truck was left at the dealer for further evaluation. No additional information at this time. Transmission still under warranty.

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