C0235 GMC Code - Open Or Grounded Rear Speed Signal Circuit
Quick Answer
The C0235 GMC code indicates an issue with the rear speed signal circuit being either open or grounded. Common causes include Damaged or corroded wiring in the rear speed signal circuit, Faulty rear wheel speed sensors, Loose or disconnected connectors in the circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C0235 GMC indicates Open Or Grounded Rear Speed Signal Circuit.
- Common causes
- Common causes include Damaged or corroded wiring in the rear speed signal circuit, Faulty rear wheel speed sensors, Loose or disconnected connectors in the circuit.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code C0235 GMC Description
The C0235 GMC code indicates an issue with the rear speed signal circuit being either open or grounded. This circuit is responsible for transmitting data from the rear wheel speed sensors to the vehicle's electronic control module (ECM) to help manage the anti-lock braking system (ABS) and traction control system. When this circuit is compromised, it can lead to inaccurate speed readings, affecting the vehicle's ability to properly regulate braking and traction control.
Common Causes of C0235 GMC
- Damaged or corroded wiring in the rear speed signal circuit
- Faulty rear wheel speed sensors
- Loose or disconnected connectors in the circuit
- ECM malfunction or software issues
- Physical damage to the ABS control module
Symptoms of C0235 GMC
- ABS warning light illuminated on the dashboard
- Traction control system malfunction indicator
- Inconsistent or erratic speedometer readings
- Increased stopping distance or difficulty braking
- Vehicle stability issues during braking or acceleration
How to Fix C0235 GMC
- Begin by conducting a thorough inspection of the rear speed signal circuit, including the wiring harness, connectors, and wheel speed sensors.
- Test the rear wheel speed sensors for proper functionality using a multimeter or diagnostic tool.
- Check for any visible damage or corrosion in the wiring and connectors, repairing or replacing as necessary.
- Clear the diagnostic trouble codes from the ECM and perform a test drive to verify that the issue has been resolved.
- If the problem persists, further diagnostics may be required to pinpoint the exact cause, such as testing the ECM or ABS control module for faults.
Cost to Fix C0235 GMC
The typical repair costs for addressing an open or grounded rear speed signal circuit can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that additional costs may apply if further diagnostics or component replacements are needed.
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Frequently Asked Questions about C0235 GMC Code
1. What does the OBDII code C0235 mean for a GMC vehicle?
C0235 indicates an issue with the rear speed signal circuit, specifically an open or grounded condition that disrupts communication with the vehicle's electronic control system.
2. What are the common symptoms of code C0235 in a GMC?
Common symptoms include the ABS warning light turning on, reduced braking performance, erratic speedometer readings, and possible activation of the traction control or stability control lights.
3. What causes code C0235 to appear on a GMC?
Potential causes include damaged wiring in the rear speed sensor circuit, a faulty rear wheel speed sensor, corroded or loose electrical connections, or a malfunctioning ABS module.
4. How can I diagnose the C0235 code on my GMC?
Start by using an OBDII scanner to confirm the code, then inspect the rear speed sensor wiring and connectors for damage or corrosion. Test the rear wheel speed sensor with a multimeter to check for proper resistance and signal output.
5. Can I drive my GMC with the C0235 code active?
While the vehicle may still be drivable, it’s not recommended as the ABS and traction control systems may not function correctly, increasing the risk of an accident in certain driving conditions.
6. How do I fix the C0235 code on my GMC?
Repairs may involve replacing a faulty rear speed sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the ABS module if it’s determined to be defective.
7. How much does it cost to fix the C0235 code on a GMC?
The cost depends on the specific repair, but replacing a rear speed sensor typically costs between $100 and $300, including parts and labor. Wiring repairs or ABS module replacement may cost more.
8. What tools are needed to repair the C0235 code?
Basic tools include an OBDII scanner, a multimeter for testing electrical components, and standard hand tools for accessing and replacing the rear speed sensor or repairing wiring.
9. Can a bad rear wheel speed sensor cause other issues besides the C0235 code?
Yes, a faulty rear speed sensor can lead to problems with the ABS, traction control, and stability control systems, as well as erratic speedometer operation.
10. Is the C0235 code specific to GMC vehicles?
No, the C0235 code can appear in other vehicles as well, but the exact diagnosis and repair process may vary depending on the make and model. Always refer to the service manual for your specific vehicle.
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