U0141
Lost Communication With Body Control Module "A"
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Enter your vehicle for a personalized diagnosis for code U0141
Code U0141 indicates that one or more control modules in your vehicle have lost communication with Body Control Module A (BCM A). In vehicles with multiple body control modules, the "A" designation typically refers to the primary BCM that handles core body electrical functions like lighting, wipers, door locks, and instrument cluster communication. The ECM sets this code when it has not received an emission-related CAN signal from the BCM for at least two seconds.
The good news is that roughly half of U0141 cases are caused by simple issues — corroded connector pins or a weak battery providing insufficient voltage. These are relatively inexpensive to diagnose and repair. However, the code can also indicate more serious problems like water damage to the BCM itself (a known issue when moisture enters the area behind the glove compartment or instrument panel) or a break in the CAN bus wiring.
Have this code diagnosed within the week. While the engine may continue to run normally, the loss of body control functions can affect lighting, security, and comfort systems in ways that compromise safety. A technician will start by checking battery voltage, inspecting the BCM connector for corrosion, and testing CAN bus communication before determining whether the module needs cleaning, reprogramming, or full replacement.
Severity
Symptoms
- •Check engine light illuminated
- •Interior lights not working or behaving erratically
- •Power windows, door locks, or mirrors unresponsive
- •Instrument cluster displays error messages or glitches
- •Wipers or turn signals may malfunction
- •Some body electrical features completely inoperative
Likely Causes
In roughly half of U0141 cases, the root cause is simply corroded connector pins or a low voltage condition from a weak battery. These are easily diagnosed and inexpensive to fix.
The BCM A module is often located behind the instrument panel or near the glove compartment. Moisture from cleaning the heater core area, a leaking windshield seal, or condensation can short the circuit board.
A break in the CAN circuit near key body connectors (often behind the glove compartment) is a well-known failure point. This can be caused by moisture intrusion, chafing, or rodent damage to wiring.
Frequent start-stop driving combined with power dropping below 9V during cranking can stress the BCM's electronics, leading to intermittent communication loss, especially on vehicles with marginal battery capacity.
Internal component failure of the Body Control Module A due to age, heat cycling, or manufacturing defects can permanently prevent it from communicating on the CAN bus.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Clean corroded BCM connector pins and apply dielectric grease
- Check battery health and replace if voltage is low
- Repair or replace damaged CAN bus wiring near body connectors
- Reprogram the BCM A module software
- Replace the Body Control Module A and reprogram