Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Trouble Code (DTC) Information ECM-U041863
Condition
The anti-lock brake system module monitors the speed on the driven wheels and compares it with the actual vehicle speed. If the Brake control module (BCM) detects that the vehicle speed is greater than the speed at the driven wheels, the vehicle is considered to be slipping on the surface. To prevent slippage, the Brake control module (BCM) requests more torque to the driven wheels. The request is sent to the Engine control module (ECM) via the CAN network.
The Engine control module (ECM) checks the actual circumstances and evaluates the received signals before any torque increases are carried out.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The signal from the Brake control module (BCM) with the request about extra wheel torque is outside its permitted range regarding duration.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Engine running for at least 3 seconds.
The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.
Substitute Value
- None.
Possible Source
- Look for the cause of the fault in the brake control module (BCM).
Fault symptom[s]
- Text window and warning symbol/Text message
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.