U0140 on Jeep
Lost Communication with BCM
U0140 on Jeep vehicles indicates lost communication with bcm. Au7o has documented this code across 1 Jeep model — most commonly on Grand Wagoneer. 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 Jeep range from $200 to $1,800, 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 Jeep by Model
Jeep Grand Wagoneer(1 issue)
- Second-Row Power Seat Memory Malfunction / Seat Fails to Return to Position2021-2024
The second-row captain's chairs equipped with power adjustment and memory functions on Grand Wagoneer L and standard models have been reported to fail to return to memorized positions or become entirely non-operational. The seat position memory module loses stored settings after a battery event, and the seat track actuator motors can bind in the rearmost position, blocking third-row access. Owner complaints on forums and NHTSA describe seats that move to a position and stop mid-travel, or refuse to respond to the Easy Entry function.
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View U0140 across all makes →Frequently Asked Questions
What does U0140 mean on Jeep?▼
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 Jeep specifically, this code is documented across 1 model.
What causes U0140 on Jeep vehicles?▼
Common causes on Jeep: 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 Jeep?▼
Repair costs on Jeep range from $200 to $1,800, depending on the specific model and root cause.
Which Jeep models have U0140 documented?▼
Au7o has documented U0140 on 1 Jeep model: Grand Wagoneer.