U0140 on GMC: How to Diagnose & Fix
Lost Communication with BCM
1 GMC model · 1 documented issue · 1 critical · $300-$800 repair
U0140 on GMC by model: symptoms, diagnosis and fix
The electronic steering column lock (ESCL) actuator in 2015-2020 Yukon XL models develops a clicking, popping, or grinding noise when turning the steering wheel, particularly at startup. In some cases, the ESCL prevents the vehicle from starting entirely, displaying a "Steering Column Lock" message. GM issued TSB 16-NA-012 acknowledging the issue. The ESCL motor gear teeth strip or the position sensor misreads, causing the lock to partially engage or fail to release.
Common Symptoms
- Clicking or popping noise from steering column on startup
- Vehicle will not start — Steering Column Lock message
- Grinding noise when turning the key or pressing start
- Intermittent no-crank condition
- Steering wheel feels temporarily locked after parking
How to Fix
Replace the electronic steering column lock actuator assembly (GM part 13501988). The replacement procedure requires disconnecting the battery, removing the lower steering column cover, and swapping the ESCL module. A Tech 2 or MDI scan tool relearn procedure must be performed after installation to program the new module to the BCM. Some owners have the ESCL permanently disabled via BCM programming at the dealer, though this may affect theft deterrent system operation.
Sources for this issue (1)
U0140 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0140 mean on a GMC?
U0140 stands for "Lost Communication with BCM." U0140 is a network communication code meaning a module has lost communication with the body control module (BCM) over the vehicle's data bus. The BCM oversees many body and convenience functions — lighting, door locks, windows, wipers, anti-theft, and gateway communications — so losing contact with it can cause a wide range of seemingly unrelated electrical problems and warning lights. This is typically a wiring, connector, power/ground, or bus fault, or a failure of the BCM itself. Because the BCM often acts as a communication hub, this code can appear alongside other 'lost communication' codes. On GMC it is documented across 1 model: Yukon XL.
What are the most common causes of U0140?
The most common causes of U0140 are: Loss of power or ground to the BCM, CAN/data bus wiring damage, short, or open circuit, Corroded, loose, or damaged BCM connectors, Blown fuse feeding the BCM, Failed body control module, Water intrusion or corrosion in the harness, Another module faulting the shared data bus. The specific cause varies by vehicle.
How much does it cost to fix U0140 on a GMC?
Published repair estimates on GMC range from $300 to $800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for U0140 on a different make?
View U0140 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.