Quick Answer
C066B means: C066B indicates a parking brake issue detected by the body control module.
Can I drive with C066B? It is recommended to address this issue immediately to avoid safety risks.
Common Questions
What does C066B mean and how does it affect my car?
C066B indicates a problem with your parking brake system, primarily affecting how your vehicle stays parked. If ignored, it could lead to unsafe conditions such as rolling when parked.
What are the most common causes of C066B and how much does it cost to fix?
Common causes include a faulty parking brake switch, damaged wiring, or a malfunctioning BCM. Repair costs can range from $100 to $400 depending on the issue.
Can I drive my car with C066B or should I stop immediately?
It's advisable to stop driving and address the C066B code immediately. Driving with a malfunctioning parking brake can pose significant safety risks.
How can I diagnose C066B myself using GeekOBD APP?
Use the GeekOBD APP to scan for codes, view freeze frame data, and check for any additional trouble codes that may assist in diagnosing the issue.
What vehicles are most commonly affected by C066B?
C066B is commonly found in 2015-2018 Chevrolet Equinox and GMC Terrain models, known for experiencing issues with the parking brake system.
How can I prevent C066B from happening again?
Regular maintenance checks on your parking brake system and ensuring all electrical connections are secure can help prevent C066B from recurring.
What is C066B?
The Diagnostic Trouble Code (DTC) C066B indicates a fault in the vehicle's body control module (BCM) related to the parking brake. Specifically, this code signifies that the BCM has detected an issue with the parking brake's performance or status. The BCM plays a crucial role in managing various electrical systems in modern vehicles, including safety features, lighting, and security systems. When C066B is triggered, it usually means that the BCM is not receiving the correct input from the parking brake system, which could be due to a faulty switch, damaged wiring, or a malfunctioning BCM itself. For car owners, this means that the parking brake may not function properly, potentially leading to unsafe driving conditions such as the vehicle rolling when parked. It’s essential to address this code promptly to ensure the safety and reliability of your vehicle. Commonly found in models like the 2015-2018 Chevrolet Equinox and GMC Terrain, C066B can be associated with symptoms like warning lights on the dashboard, and in some cases, it can affect other systems like the stability control. Ignoring this code can lead to more significant issues, so it's advisable to seek a professional diagnosis and repair to avoid further complications.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C066B is present:
- The parking brake indicator light remains illuminated on the dashboard, signaling a potential malfunction.
- A noticeable delay or failure in the engagement of the parking brake, which may cause the vehicle to roll when parked.
- Inconsistent behavior of other electrical systems, such as dashboard lights flickering or failure of the vehicle's stability control system.
- Unusual noises when attempting to engage or disengage the parking brake, indicating possible mechanical failure.
- Difficulty in releasing the parking brake, which may require additional force or manipulation.
Possible Causes
Most common causes of C066B (ordered by frequency):
- The most common cause of C066B (approximately 60% likelihood) is a faulty parking brake switch, which may not properly signal the BCM.
- Another potential cause (about 20%) is damaged wiring or connectors within the parking brake system that can disrupt communication between components.
- A malfunctioning BCM itself can contribute to this code, often requiring reprogramming or replacement (10% likelihood).
- Less common, but serious, is the mechanical failure of the parking brake assembly, which may require significant repairs.
- A rare cause could be software issues within the BCM, necessitating a software update or reflash to resolve the problem.
C066B Repair Costs
Cost Breakdown by Repair Type
Parking Brake Switch Replacement
Replacing the faulty parking brake switch to restore proper functionality.
- Total: $100 - $300
- Success rate: 85%
Wiring Repair
Repairing damaged wiring or connectors related to the parking brake system.
- Total: $150 - $400
- Success rate: 90%
BCM Reprogramming
Reprogramming the Body Control Module to correct software issues.
- Total: $75 - $150
- Success rate: 70%
Money-Saving Tips for C066B
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional C066B Diagnosis Process
Follow these systematic steps to accurately diagnose C066B. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the parking brake and BCM (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the parking brake and BCM (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and history (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and history (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter to check the parking brake switch and wiring integrity (20-30 minutes)
Step 3: Component testing - Use a multimeter to check the parking brake switch and wiring integrity (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation of the parking brake and other related systems after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation of the parking brake and other related systems after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm the success of repairs and check for any recurring symptoms (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm the success of repairs and check for any recurring symptoms (15-20 minutes).
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: 2016 Chevrolet Equinox: Parking Brake Malfunction
Vehicle: 2016 Chevrolet Equinox, 60,000 miles
Problem: Customer reported that the parking brake indicator light was illuminated and the brake was not engaging properly.
Diagnosis: Performed an OBD2 scan and found code C066B. Visual inspection revealed a damaged parking brake switch.
Solution: Replaced the faulty parking brake switch and cleared the code. Conducted a system function test to ensure proper operation.
Cost: $150 (parts: $50 for switch, labor: $100)
Result: The repair successfully resolved the issue, and the parking brake functioned correctly during the follow-up test drive.
Case Study 2: 2017 GMC Terrain: BCM Reprogramming
Vehicle: 2017 GMC Terrain, 45,000 miles
Problem: Customer experienced intermittent parking brake issues and dashboard warning lights.
Diagnosis: Diagnosed with C066B through OBD2 scan; further testing indicated software issues with the BCM.
Solution: Reprogrammed the BCM and replaced a frayed wire in the parking brake circuit.
Cost: $200 (parts: $20 for wiring, labor: $180 for reprogramming)
Result: Post-repair, the parking brake operated smoothly, and the warning lights were resolved.