C1218 Buick 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 Buick 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 Buick 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 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What does the OBDII code C1218 mean on a Buick?
C1218 indicates an issue with the pump motor circuit, specifically that it is shorted to voltage or the motor ground is open.
2. What are the common symptoms of code C1218 in a Buick?
Common symptoms include the ABS warning light being illuminated, reduced braking performance, or the ABS system not functioning correctly.
3. What causes the C1218 code to trigger?
The code can be caused by a short circuit in the pump motor wiring, an open motor ground, a faulty ABS pump motor, or a problem with the ABS module.
4. Can I still drive my Buick with the C1218 code present?
While the vehicle may still be drivable, the ABS system may not function properly, potentially increasing the risk of losing control during hard braking.
5. How do I diagnose the C1218 code on my Buick?
Check the ABS pump motor wiring for shorts or damage, inspect the motor ground connection, and test the ABS pump motor and module for proper operation.
6. How can I fix the C1218 code on a Buick?
Repairs may include repairing or replacing damaged wiring, cleaning or securing the motor ground connection, or replacing the ABS pump motor or module if faulty.
7. Is the C1218 code specific to certain Buick models?
The C1218 code can appear on various Buick models equipped with ABS systems, but the exact repair process may vary slightly between models.
8. How much does it cost to repair the C1218 code on a Buick?
Repair costs depend on the specific issue, ranging from $100 for simple wiring repairs to over $1,000 if the ABS module or pump motor needs replacement.
9. Can a weak battery cause the C1218 code to appear?
Yes, low voltage or a weak battery can sometimes contribute to ABS-related codes, including C1218, by affecting the system’s electrical performance.
10. Do I need a professional mechanic to fix the C1218 code on my Buick?
While some issues, like wiring repairs or ground cleaning, can be handled by experienced DIYers, diagnosing and replacing the ABS pump motor or module often requires professional expertise.
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