C1218 GMC Code - Pump Motor Circuit Shorted To Voltage Or Motor Ground Open
Quick Answer
The system relay is energized when the ignition is ON. Common causes include Faulty Brake Pressure Modulator Valve (BPMV), Brake Pressure Modulator Valve (BPMV) harness is open or shorted, Brake Pressure Modulator Valve (BPMV) circuit poor electrical connection. 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
- C1218 GMC indicates Pump Motor Circuit Shorted To Voltage Or Motor Ground Open.
- Common causes
- Common causes include Faulty Brake Pressure Modulator Valve (BPMV), Brake Pressure Modulator Valve (BPMV) harness is open or shorted, Brake Pressure Modulator Valve (BPMV) circuit poor electrical connection.
- 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.
Code C1218 GMC Description
- Transfers brake fluid from the brake calipers to the master cylinder reservoir during pressure decrease events.
- Transfers brake fluid from the master cylinder reservoir to the brake calipers during pressure increase events.
What are the Possible Causes of the DTC C1218 GMC?
- Faulty Brake Pressure Modulator Valve (BPMV)
- Brake Pressure Modulator Valve (BPMV) harness is open or shorted
- Brake Pressure Modulator Valve (BPMV) circuit poor electrical connection
- Faulty Electronic Brake Control Module (EBCM)
How to Fix the DTC C1218 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1218 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about C1218 GMC Code
1. What are the common symptoms of OBDII code C1218 GMC?
- The common symptoms include the ABS warning light illuminating on the dashboard, potential loss of ABS functionality, and unusual braking behavior.
2. What can cause the OBDII code C1218 GMC to trigger?
- The code can be triggered by a pump motor circuit being shorted to voltage or having an open ground, indicating a problem with the ABS system's pump motor.
3. How can I diagnose the issue causing code C1218 GMC?
- Diagnosis typically involves inspecting the wiring and connectors related to the ABS pump motor, checking for any visible damage or loose connections, and performing circuit tests with a multimeter.
4. What are some possible repair tips for resolving code C1218 GMC?
- Repair tips may include repairing or replacing damaged wiring or connectors, checking and possibly replacing the ABS pump motor, and ensuring proper grounding of the ABS system components.
5. Can I continue driving my vehicle with OBDII code C1218 GMC present?
- It is not recommended to drive the vehicle with the ABS warning light on, as it indicates a potential issue with the anti-lock braking system that could affect overall braking performance.
6. How serious is OBDII code C1218 GMC?
- The code indicates a malfunction in the ABS system, which is a critical safety component. It is important to address the issue promptly to ensure the proper functioning of the anti-lock braking system.
7. Is it safe to reset the OBDII code C1218 GMC and clear the ABS warning light?
- While clearing the code may temporarily turn off the ABS warning light, it is crucial to diagnose and repair the underlying issue causing the code to prevent potential safety risks while driving.
8. Can a DIY enthusiast repair OBDII code C1218 GMC at home?
- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair simple wiring or connector issues related to the ABS pump motor circuit. However, complex repairs may require professional assistance.
9. How much does it typically cost to repair OBDII code C1218 GMC at a repair shop?
- The cost of repairs can vary depending on the extent of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from reputable repair shops for an accurate estimate.
10. Are there any preventive measures to avoid OBDII code C1218 GMC in the future?
- Regular maintenance of the ABS system, such as checking for any signs of wear or damage, keeping electrical components clean and dry, and addressing any warning lights promptly, can help prevent issues leading to code C1218 GMC.
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