Test E: DTCs C1233 (LF) C1234 (RF C1235 (RR) and C1236 (LR) - Wheel Speed Sensor Signal Fault

Pinpoint Test E: DTCs C1233 (LF), C1234 (RF), C1235 (RR) and C1236 (LR) - Wheel Speed Sensor Signal Fault

Normal Operation
The wheel speed sensor and sensor ring generate a square wave signal to the anti-lock brake system (ABS) module that is proportional to the wheel speed. The ABS module compares the wheel speed inputs from all the wheel speed sensors to determine an impending wheel lockup. Incorrect tire size can set these DTCs as well.

Possible Causes
^ Mismatched tire sizes
^ Wheel speed sensor ring (part of the wheel bearing and hub assembly)
^ Wheel speed sensor
^ ABS module

E1-E3:

E4-E8:

E9: