U0140 on Jeep: How to Diagnose & Fix
Lost Communication with BCM
2 Jeep models · 2 documented issues · $200-$1,800 repair
U0140 on Jeep by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Second-row seat stops mid-travel during adjustment
- Memory seat position lost after battery disconnect or replacement
- Easy Entry function fails to slide seat forward for third-row access
- Seat buttons unresponsive or require multiple presses
- Error message on cluster related to seat system
How to Fix
Reprogram seat memory module via dealer J2534 tool with latest software update. If motor binding is present, the seat track assembly requires lubrication with Mopar seat track lubricant or replacement of the seat track motor assembly. In some cases, replacing the seat control module (SCM) resolves the memory loss issue permanently.
Uconnect resets or a blank screen, intermittent accessories, a discharged battery, and communication faults may occur together, but they do not establish that the Body Control Module is defective. Radio software or hardware, a weak battery or charging problem, poor power or ground, damaged CAN wiring or terminals, another module that will not sleep, and a true internal module fault can overlap. FCA has a software bulletin for specific early 2014 WK vehicles with RA3/RA4 radios, including radio resets and radio-caused battery drain, but that bulletin is sales-code and build-date specific and does not justify replacing a BCM, Intelligent Battery Sensor, or battery on every 2014-2018 vehicle.
Common Symptoms
- Uconnect radio resets, locks up, goes blank, or responds slowly
- Intermittent accessory or warning-lamp behavior
- Battery is discharged after the vehicle sits
- One or more modules store lost-communication faults
How to Fix
Start with a complete vehicle scan and save active, stored, and environmental data before clearing anything. Load-test the battery, verify charging voltage, and repair low-voltage faults first. Inspect the relevant fuses, power feeds, grounds, connectors, and CAN wiring, then measure key-off draw only after the vehicle has completed its normal sleep period and isolate the circuit that remains awake. For radio resets, identify the exact radio sales code and vehicle build date and check the VIN for the applicable FCA software or radio procedure. For a lost-communication fault, determine whether the named module is actually offline, whether multiple modules logged against it, and whether its power, ground, and network circuits pass before condemning it. Replace and VIN-configure a BCM, radio, IBS, or battery only when the component-specific test proves it failed.
Owner tips & cautions
- WarningU0140 means communication with the BCM was lost; it does not prove the BCM itself failed. Voltage, power, ground, wiring, network, and reporting-module faults must be separated first.
- TipAsk the shop to show the sleep-current measurement, the circuit that stayed awake, and the network scan before authorizing an expensive programmed module.
Sources for this issue (2)
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 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 it is documented across 2 models: Grand Wagoneer, Grand Cherokee.
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 Jeep?
Published repair estimates on Jeep range from $200 to $1,800 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.