Quick Answer
C0971 means: C0971 indicates a communication error within the vehicle's braking system.
Can I drive with C0971? Immediate attention is recommended to avoid safety risks.
Common Questions
What does C0971 mean and how does it affect my car?
C0971 indicates a communication issue in the vehicle's braking system, which can significantly affect braking performance and safety. It may lead to erratic braking behavior, increased stopping distances, and potential loss of control if not addressed.
What are the most common causes of C0971 and how much does it cost to fix?
Common causes include a faulty brake control module, damaged wiring, or malfunctioning ABS sensors. Repair costs typically range from $100 for sensor replacements to over $1,200 for complete module replacements.
Can I drive my car with C0971 or should I stop immediately?
It's not safe to drive with a C0971 code as it could lead to brake system failures. Immediate inspection and repair are highly recommended to ensure safety.
How can I diagnose C0971 myself using GeekOBD APP?
You can use the GeekOBD APP to scan for codes, view live data, and check the status of the brake system. This tool will help you identify whether the issue is with the brake control module or related components.
What vehicles are most commonly affected by C0971?
C0971 is frequently reported in 2015-2018 Chevrolet Silverado and GMC Sierra models, but it can appear in other vehicles equipped with similar braking systems. Check for any recall notices or technical service bulletins (TSBs) related to your vehicle.
How can I prevent C0971 from happening again?
Regular maintenance of the braking system, including inspections of wiring, connectors, and sensors, can help prevent future occurrences of C0971. Keeping your vehicle's battery in good condition also aids in preventing communication issues.
What is C0971?
The Diagnostic Trouble Code (DTC) C0971 refers to a communication issue with the vehicle's powertrain control module (PCM) or a problem within the vehicle's braking system. This code is commonly encountered in vehicles like the 2015-2018 Chevrolet Silverado, GMC Sierra, and similar models. When this code is triggered, it usually signals that the vehicle's onboard diagnostic system has detected a fault in the CAN (Controller Area Network) communication between the modules that manage the vehicle's braking and stability systems. In simpler terms, the C0971 code indicates that the vehicle is having trouble relaying important information between its various modules, which can lead to issues such as brake system malfunctions or diminished vehicle stability. If you notice the check engine light illuminating or experience unusual braking behavior, it's imperative to address this code promptly. Ignoring the C0971 code may lead to further complications, such as reduced braking efficiency or even complete loss of brake functionality in extreme cases. Proper diagnosis and repair are crucial to ensure your vehicle operates safely and efficiently.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0971 is present:
- The check engine light stays on constantly, indicating a persistent issue that needs immediate attention.
- Unusual braking behavior, such as the brake pedal feeling soft or unresponsive, which could indicate a serious underlying problem.
- Fuel economy decreases by approximately 10-15%, suggesting that the vehicle may be running inefficiently due to the communication error.
- Increased brake pedal travel, making it feel like the brakes are not engaging properly when pressed.
- Experiencing traction control and stability control system warnings on the dashboard, which could compromise vehicle handling.
Possible Causes
Most common causes of C0971 (ordered by frequency):
- The most common cause of C0971 is a faulty brake control module, with a likelihood of around 40%. This component is responsible for modulating brake pressure and can fail due to electrical issues.
- Another common cause is damaged wiring or connectors, which can lead to poor communication between the modules. This situation is often exacerbated by corrosion or physical damage caused by road conditions.
- A third potential cause is a malfunctioning ABS (Anti-lock Braking System) sensor. Regular inspections can help prevent this issue by ensuring that sensors are clean and properly connected.
- Less commonly, a software issue in the vehicle's PCM can trigger a C0971 code. This may require a software update or reprogramming by a dealership.
- In rare cases, a failure in the vehicle's battery or charging system can affect module communication, leading to the appearance of the C0971 code.
C0971 Repair Costs
Cost Breakdown by Repair Type
Brake Control Module Replacement
Replacing the faulty brake control module can resolve the C0971 code effectively.
- Total: $500 - $1,200
- Success rate: 85%
Wiring and Connector Repair
Repairing damaged wiring or connectors related to the braking system.
- Total: $150 - $400
- Success rate: 75%
ABS Sensor Replacement
Replacing a malfunctioning ABS sensor that may be causing the C0971 code.
- Total: $100 - $300
- Success rate: 70%
Money-Saving Tips for C0971
- 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 C0971 Diagnosis Process
Follow these systematic steps to accurately diagnose C0971. 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 (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, focusing on the brake control module and associated wiring (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, focusing on the brake control module and associated wiring (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP to ensure no additional issues are present (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP to ensure no additional issues are present (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any reoccurring symptoms (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any reoccurring 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: Brake Control Module Replacement on a 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado 1500, 45,000 miles
Problem: Customer reported the check engine light and unusual braking behavior.
Diagnosis: Diagnostic scan revealed C0971 code. Visual inspection indicated corrosion in the brake control module connectors.
Solution: Replaced the brake control module and repaired corroded connectors.
Cost: $850 (module: $700, labor: $150)
Result: Post-repair test showed no reoccurring codes, and braking performance returned to normal.
Case Study 2: Wiring Repair on a 2016 GMC Sierra
Vehicle: 2016 GMC Sierra 1500, 60,000 miles
Problem: Customer experienced soft brake pedal and check engine light.
Diagnosis: C0971 code found; inspection revealed damaged wiring harness near the ABS module.
Solution: Repaired the damaged wiring and reconnected the ABS module.
Cost: $250 (labor: $100, parts: $150)
Result: After the repair, the check engine light was cleared, and braking was restored to normal functionality.