U0140 on Chevrolet: How to Diagnose & Fix
Lost Communication with BCM
2 Chevrolet models · 2 documented issues · $150-$800 repair
U0140 on Chevrolet by model: symptoms, diagnosis and fix
The 2015+ Suburban uses an electronic steering column lock that can malfunction, causing a clicking noise from the steering column, failure to recognize the key fob, or preventing the vehicle from starting. The electronic lock module replaces the traditional key-cylinder lock and communicates with the body control module (BCM) to verify the key fob is present before allowing the engine to start. When the lock module fails, it may click repeatedly without unlocking, or it may not engage at all, leaving the steering unlocked even when the vehicle is off.
Common Symptoms
- Rapid clicking noise from steering column
- Vehicle will not start — "Steering Column Lock" message
- Key fob not detected despite fresh battery
- Steering wheel does not lock when vehicle is off
- Intermittent no-start condition
- Multiple clicks before engine starts
How to Fix
The steering column lock actuator module needs replacement ($150-$400 for parts, $200-$400 labor). The module is located inside the steering column and requires partial disassembly to access. A scan tool is needed to program the new module to the BCM after installation. In some cases, a BCM software update at the dealer resolves the clicking without hardware replacement. If the vehicle will not start due to a failed lock module, a tow to the dealer is required — there is no manual override.
Sources for this issue (1)
As a first-model-year EV on GM's Ultium platform, the Equinox EV experiences various software glitches including infotainment freezing, incorrect range estimates, phantom driver assistance warnings, and occasional 12V auxiliary battery management issues. These are typical new-platform teething problems.
Common Symptoms
- Infotainment screen freezes or goes black
- Incorrect range estimate
- False collision warnings
- Vehicle fails to enter Ready mode
- 12V battery drain overnight
How to Fix
Keep the vehicle software updated via OTA updates — GM is actively pushing fixes. Perform a vehicle reset by parking, locking, and waiting 5 minutes before restarting. For persistent issues, the dealer can perform a full system reflash. The 12V battery may need replacement if it was drained by a software bug.
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 Chevrolet?
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 Chevrolet it is documented across 2 models: Suburban, Equinox EV.
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 Chevrolet?
Published repair estimates on Chevrolet range from $150 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.