Hybspec

C1235

Wysoki

Rear Wheel Speed Sensor Signal Error – ABS Module Malfunction Causing Incorrect Brake System Operation.

OBD-II (EN): Rear Wheel Speed Sensor Signal Error

Code C1235 indicates a problem with the rear wheel speed sensor signal, which can result in the ABS or ESP system being disabled. The cause could be a faulty sensor, a wiring break, or a fault within the ABS module itself. Due to the direct impact on brake system safety, immediate workshop diagnosis is recommended.

Symptoms

ABS or ESP warning light illuminated on the dashboard; ABS and/or traction control system may be disabled; no ABS reaction during hard braking; possible jerking during braking; warning message on the instrument cluster display.

Possible causes

• Damaged or contaminated rear wheel speed sensor (ABS sensor) • Open or short circuit in the wiring harness leading to the sensor • Damaged tone ring (encoder) on the wheel hub • Malfunction or software issue within the ABS control module • Incorrect adaptations after replacing the ABS module or sensor

Affected systems

ABSESP/ESCUkład hamulcowyKontrola trakcji (TCS)

Related codes

Does code C1235 require professional diagnostics?

The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.