C0235 Buick Code - Open Or Grounded Rear Speed Signal Circuit

Code C0235 indicates an issue with the rear speed signal circuit, such as an open or grounded condition, which affects the vehicle's ability to monitor rear wheel speed.

Symptoms may include the ABS warning light illuminating, traction control system malfunction, reduced braking performance, or inaccurate speed readings.

Common causes include damaged wiring in the rear speed sensor circuit, a faulty rear speed sensor, corroded connectors, or issues with the ABS control module.

Start by inspecting the rear speed sensor and its wiring for damage, corrosion, or disconnection. Use a multimeter to check for continuity and proper voltage in the circuit.

Yes, a defective rear speed sensor is one of the most common reasons for this code, as it disrupts the signal needed for the ABS and traction systems.

Repairs may include replacing the rear speed sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or, in rare cases, replacing the ABS module.

While the vehicle may still be drivable, the ABS and traction control systems may not function properly, increasing the risk of skidding or loss of control in slippery conditions.

Repair costs vary but typically range from $100 to $300, depending on whether the issue involves the sensor, wiring, or ABS module.

A low or weak battery can sometimes cause electrical issues, but it is less likely to be the sole cause of this code. Check the battery and charging system as part of the diagnostic process.

Clearing the code will turn off the warning light temporarily, but unless the underlying issue is resolved, the code will return. Inspect and repair the circuit as needed.