C0286 GMC Code - Medium Pressure Accumulator Switch Intermittent
Quick Answer
The Brake Pressure Modulator Valve (BPMV) contains a Medium Pressure Accumulator (MPA). 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
- C0286 GMC indicates Medium Pressure Accumulator Switch Intermittent.
- 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 C0286 GMC Description
The integrity of the MPA switch is tested by the Electronic Brake Control Module (EBCM). The MPA is partially discharged during system initialization to open the switch and then recharged to close the switch. The EBCM continues to monitor the switch to ensure the MPA remains charged. Provided the VSES is not activated, the MPA should remain charged for the entire ignition cycle. If the MPA switch opens within 5 minutes of closing, a fast leak down condition is detected. If the MPA switch opens after 5 minutes has passed, a slow leak down condition is detected.
What are the Possible Causes of the DTC C0286 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
How to Fix the DTC C0286 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 C0286 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 C0286 GMC Code
1. What does OBDII code C0286 mean on a GMC?
C0286 indicates an intermittent issue with the medium pressure accumulator switch, which is part of the vehicle's brake or stability control system.
2. What are common symptoms of code C0286 in a GMC?
Common symptoms include an illuminated ABS or stability control warning light, reduced braking performance, or erratic brake system behavior.
3. What causes the C0286 code to appear?
The code can be triggered by a faulty medium pressure accumulator switch, damaged wiring, corroded electrical connections, or low brake fluid levels.
4. Can I drive my GMC with a C0286 code?
While the vehicle may still be drivable, brake system performance may be compromised, increasing the risk of an accident. It’s best to address the issue promptly.
5. How do I diagnose the C0286 code on a GMC?
Start by inspecting the medium pressure accumulator switch, checking for damaged wiring or loose connections, and using a scan tool to monitor switch behavior.
6. How is the C0286 code repaired?
Repairs may involve replacing the medium pressure accumulator switch, repairing wiring or connectors, or addressing brake fluid level/pressure issues.
7. How much does it cost to fix code C0286 on a GMC?
The repair cost can range from $150 to $400, depending on whether the switch, wiring, or other components need replacement.
8. Can low brake fluid cause a C0286 code on a GMC?
Yes, low brake fluid can affect pressure in the brake system and may contribute to triggering this code.
9. What tools are needed to fix the C0286 code?
You’ll typically need a scan tool to read and clear codes, a multimeter for testing electrical connections, and basic hand tools for component replacement.
10. Does clearing the C0286 code fix the problem?
Clearing the code without addressing the underlying issue will only temporarily remove the warning light, and the code is likely to return.
Discuss the causes and fixes for C0286 GMC OBDII Code
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