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.
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HOMESERVICE MANUALSJEEP2023GRAND CHEROKEE TRAILHAWK 4XEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 61 (5.7L - DTCS P3401 TO U0404)DTC TROUBLESHOOTINGU0129 LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE 1SET CONDITION
2023 Jeep Grand Cherokee Trailhawk 4xe
Set Condition
2023 Jeep Grand Cherokee Trailhawk 4xeSECTION Set Condition
WARNING: This page is about a different variant/trim than selected.
- C053D - The PCM determines that the Brake Pedal Pressure Sensor signal is irrational.
- C10F5 - The PCM determines that the Brake Torque signal is irrational.
- P057B - The PCM determines that the Brake Pedal Position Sensor signal is irrational.
- U0121 - The PCM does not receive the Brake Pedal Position Sensor signal.
- U0129 - The PCM does not receive the Brake Pedal Pressure Sensor signal.
- U0418 - The PCM receives an SNA message indicating that the has detected a fault in the Brake Pedal Pressure Sensor signal.
- U11BF - The PCM receives an SNA message indicating that the has detected a fault in the Brake Pedal Position Sensor signals
- (C0501, C0507, C050D, C0513) Wheel Speed Signal Rationality Faults - When at a stop, one WSS signal is showing vehicles speed output and the other three WSS signals are reading 0 OR When the difference between one WSS signal compared to the other three WSS signals is more than 11 MPH, for 30 seconds.
- (U1409, U140A, U140B, U140C, U1412, U1417, U1418) Implausible Wheel Speed and Distance Signal Faults - These faults will typically set when the BSCM detects a fault with one of the WSS signals. The BSCM will send an SNA or error flag against the sensor.
The (P057B, C053D, C10F5, U0418, U11BF) performance and implausible/lost message faults can set for any of the following:
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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.