Quick Answer
C0291 means: DTC C0291 indicates a malfunction in the ABS control module, affecting the anti-lock braking system.
Can I drive with C0291? Immediate attention recommended to ensure safe braking performance.
Common Questions
What does C0291 mean and how does it affect my car?
DTC C0291 signifies an issue with your vehicle's ABS control module. This can severely impact braking efficiency and safety, especially in wet or slippery conditions. If this code appears, your ABS may not engage, which can lead to longer stopping distances and potential accidents.
What are the most common causes of C0291 and how much does it cost to fix?
The primary cause of C0291 is often a faulty ABS control module, typically costing between $400 and $800 to replace. Other causes may include damaged wiring or sensors, which can range from $100 to $250 to repair. It's essential to diagnose the exact cause to avoid unnecessary expenses.
Can I drive my car with C0291 or should I stop immediately?
It's advised not to drive your vehicle with the C0291 code active, as this indicates a problem with your ABS. This could lead to diminished braking performance, especially in emergencies. If the ABS warning light is illuminated, seek a repair as soon as possible.
How can I diagnose C0291 myself using GeekOBD APP?
To diagnose C0291 using the GeekOBD APP, connect the app to your vehicle, run a full OBD2 scan, and note any trouble codes displayed. Pay attention to freeze frame data, which provides context about vehicle conditions when the code was triggered. This helps pinpoint the issue more accurately.
What vehicles are most commonly affected by C0291?
DTC C0291 is commonly found in models such as the 2007-2017 Chevrolet Silverado, 2007-2016 GMC Sierra, and other GM vehicles equipped with ABS systems. Regular maintenance and checks are crucial for these models to prevent ABS failures.
How can I prevent C0291 from happening again?
Preventive measures include regular inspections of the ABS wiring and connectors for any signs of wear or corrosion. Keeping your braking system well-maintained and ensuring that software updates are performed can also help in preventing the recurrence of C0291.
What is C0291?
DTC C0291 is a diagnostic trouble code that indicates a malfunction in the Anti-lock Braking System (ABS) control module. This code is primarily associated with vehicles like the 2007-2017 Chevrolet Silverado, but can also appear in other makes and models equipped with ABS systems. When C0291 is triggered, it usually signifies that the ABS control module has detected a fault in its internal circuit or has failed to communicate properly with the vehicle's onboard computer. In practical terms, this means that the ABS system may not function correctly, which can compromise your vehicle's braking performance, particularly in slippery conditions. Drivers may notice the ABS warning light illuminated on their dashboard, indicating that the system is disabled. This could lead to decreased braking efficiency and increased stopping distances, especially during emergency braking situations. Addressing this issue promptly is crucial for maintaining the safety and functionality of your braking system, as neglecting it could lead to more severe problems and higher repair costs down the road.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0291 is present:
- ABS warning light illuminated on the dashboard, indicating system malfunction.
- Braking system feeling less responsive, especially on slippery surfaces during hard stops.
- Unusual noises coming from the ABS module during braking, such as grinding or buzzing sounds.
- Inconsistent brake pedal feel, with variations in resistance when pressed.
- Potential for the brakes to lock up in emergency situations, increasing stopping distance.
Possible Causes
Most common causes of C0291 (ordered by frequency):
- The most common cause of C0291 is a faulty ABS control module, which accounts for approximately 60% of cases. This can happen due to electrical failure or internal component issues.
- Another significant cause is damaged wiring or connectors related to the ABS system, which can disrupt communication and function. This is often due to wear and tear or exposure to harsh environmental conditions.
- Corrosion at the connector points can lead to intermittent issues, so regularly checking and cleaning these areas can prevent future occurrences.
- Less commonly, a failed wheel speed sensor can trigger the C0291 code as it communicates vital information to the ABS module.
- Rarely, software glitches in the vehicle's onboard computer system can also lead to the appearance of this code, necessitating a software update or reprogramming.
C0291 Repair Costs
Cost Breakdown by Repair Type
ABS Control Module Replacement
Replacing the faulty ABS control module with a new or refurbished unit.
- Total: $400 - $800
- Success rate: 85%
Wiring Repair
Repairing damaged wiring or connectors that are causing communication issues with the ABS system.
- Total: $100 - $300
- Success rate: 75%
Wheel Speed Sensor Replacement
Replacing a defective wheel speed sensor that may be triggering the code.
- Total: $150 - $250
- Success rate: 70%
Money-Saving Tips for C0291
- 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 C0291 Diagnosis Process
Follow these systematic steps to accurately diagnose C0291. 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 ABS module and sensors (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion around the ABS module and sensors (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all diagnostic trouble codes and freeze frame data to understand the context of the fault (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all diagnostic trouble codes and freeze frame data to understand the context of the fault (10-15 minutes).
Step 3: Step 3: Component testing - Utilize a multimeter to test the ABS control module and related sensors for proper voltage and resistance (20-30 minutes)
Step 3: Component testing - Utilize a multimeter to test the ABS control module and related sensors for proper voltage and resistance (20-30 minutes).
Step 4: Step 4: System function test - After repairs, verify the operational functionality of the ABS system and clear any stored codes (10-15 minutes)
Step 4: System function test - After repairs, verify the operational functionality of the ABS system and clear any stored codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to ensure that the ABS is functioning correctly and that the C0291 code does not reappear (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to ensure that the ABS is functioning correctly and that the C0291 code does not reappear (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: ABS Module Replacement on 2010 Chevrolet Silverado
Vehicle: 2010 Chevrolet Silverado, 85,000 miles
Problem: Customer reported ABS warning light illuminated and inconsistent braking performance.
Diagnosis: After scanning with GeekOBD APP, C0291 was the only code present. Visual inspection revealed a faulty ABS control module.
Solution: Replaced the ABS control module and performed a system reset using the GeekOBD APP.
Cost: $650 (parts: $550, labor: $100)
Result: ABS warning light cleared and system functioned correctly in post-repair tests.
Case Study 2: Wiring Repair on 2015 GMC Sierra
Vehicle: 2015 GMC Sierra, 60,000 miles
Problem: Customer complained of intermittent ABS light and sporadic braking issues.
Diagnosis: C0291 was retrieved via OBD scan. Inspection revealed corroded wiring connections.
Solution: Repaired the damaged wiring and cleaned connections; no parts needed.
Cost: $150 (labor only)
Result: ABS system restored to full function, with no further issues reported.