What it means
A receiving module detected implausible data from the rear power steering control module (rear-wheel steering). Steer angle command vs. actual values fail plausibility checks and are rejected.
At a glance
- Usually lights the warning light of the system that lost communication
- The engine or gearbox may go into limp mode
How it works
The rear power steering control module manages rear-wheel steering and reports steering commands and measured rear steering angle to other modules. U0435 sets when a receiving module rejects that rear steering data as implausible. A module or sensor fault, incompatible software, or a network routing problem can leave rear-wheel steering disabled or limited.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan all modules and save U0435, steering codes, and freeze-frame data to determine which module rejected the rear steering messages.
- Read rear steering command and actual angle data with a scan tool, checking for missing, stuck, or inconsistent values.
- Inspect the rear steering actuator, angle-sensing components, connectors, grounds, and CAN wiring for damage or loose connections.
- Check whether the rear steering module or related parts were replaced, and verify software compatibility and configuration.
- Test rear steering power, ground, signal circuits, and CAN communication to the manufacturer's specification before replacing components.
Common fixes
- Repair a loose or corroded rear steering connector or ground.
- Repair damaged wiring to the rear steering module or actuator.
- Correct incompatible software or configuration following a module replacement.
- Repair a confirmed gateway or CAN network fault.
- Replace or calibrate a rear steering sensor, actuator, or module only after testing identifies it as the cause.
Can I keep driving?
Rear-wheel steering may be unavailable, changing how the vehicle turns and tracks. Drive slowly and avoid sharp maneuvers; stop if steering feels abnormal or a steering warning indicates the vehicle is unsafe.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.