U0140 on Chevrolet
Lost Communication with BCM
U0140 on Chevrolet vehicles indicates lost communication with bcm. Au7o has documented this code across 2 Chevrolet models — most commonly on Equinox EV, Suburban. 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. Typical repair costs on Chevrolet range from $150 to $800, depending on the specific model and root cause.
Common Causes of U0140
- •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
U0140 on Chevrolet by Model
Chevrolet Equinox EV(1 issue)
- Infotainment and Vehicle Software Glitches Requiring Reboot2024-2025
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.
Chevrolet Suburban(1 issue)
- Steering Column Lock and Click Noise2015-2025
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.
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View U0140 across all makes →Frequently Asked Questions
What does U0140 mean on 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 specifically, this code is documented across 2 models.
What causes U0140 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0140 on a Chevrolet?▼
Repair costs on Chevrolet range from $150 to $800, depending on the specific model and root cause.
Which Chevrolet models have U0140 documented?▼
Au7o has documented U0140 on 2 Chevrolet models: Equinox EV, Suburban.