Quick Answer
C0171 means: C0171 indicates a malfunction in the left front wheel speed sensor circuit.
Can I drive with C0171? Immediate attention is required to ensure safe vehicle operation.
Common Questions
What does C0171 mean and how does it affect my car?
C0171 indicates a problem with the left front wheel speed sensor circuit, impacting your ABS and vehicle stability. If not addressed, it can lead to compromised braking performance, especially in emergency situations.
What are the most common causes of C0171 and how much does it cost to fix?
Common causes include a faulty wheel speed sensor (60% likelihood) and damaged wiring. Repair costs can range from $100 for sensor replacement to $80 for wiring repairs.
Can I drive my car with C0171 or should I stop immediately?
It's not advisable to drive if C0171 is present, as it indicates potential ABS failure, which can significantly affect braking safety. It's best to have the issue diagnosed and repaired as soon as possible.
How can I diagnose C0171 myself using GeekOBD APP?
With the GeekOBD APP, you can scan for DTCs, view freeze frame data, and check the operation of the wheel speed sensor. This will help you determine if the sensor is functioning properly or if there's a wiring issue.
What vehicles are most commonly affected by C0171?
C0171 is frequently seen in 2000-2015 Chevrolet and GMC models such as the Silverado, Tahoe, and Sierra with ABS systems. Always check for any recalls or technical service bulletins (TSBs) related to your vehicle.
How can I prevent C0171 from happening again?
Regular maintenance, including inspecting the ABS system and keeping wiring connections clean, can help prevent C0171. Additionally, avoid driving through deep water or snow that might damage the sensors.
What is C0171?
The C0171 diagnostic trouble code (DTC) indicates an issue with the left front wheel speed sensor circuit, particularly in 2000-2015 Chevrolet and GMC vehicles. This code is part of the anti-lock braking system (ABS) and can lead to a malfunctioning ABS. When the vehicle's onboard diagnostics detects an anomaly in the wheel speed sensor readings, it triggers the C0171 code. If this code appears, the ABS may not function properly, which can affect the vehicle's stability and braking performance. Drivers may notice issues such as the ABS warning light illuminating on the dashboard. The root cause of this code could range from a faulty wheel speed sensor to damaged wiring or poor connections. Ignoring this code can lead to increased stopping distances and potential safety hazards, making it crucial for vehicle owners to address it promptly. To resolve the issue, a thorough diagnostic process is needed to identify the specific cause, which may involve inspecting sensor functionality and wiring integrity. Understanding C0171 is essential for maintaining vehicle safety and ensuring optimal braking performance.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0171 is present:
- The ABS warning light is illuminated on the dashboard, indicating a potential braking issue.
- The vehicle may experience reduced braking efficiency, particularly during sudden stops or slippery conditions.
- Drivers might notice the brake pedal pulsating when applied, indicating that the ABS is not functioning correctly.
- Inconsistent handling during sharp turns, which can be attributed to faulty ABS engagement.
- Potential for erratic speedometer readings due to sensor malfunction.
Possible Causes
Most common causes of C0171 (ordered by frequency):
- The most common cause of C0171 (approximately 60% likelihood) is a faulty left front wheel speed sensor, which may fail due to wear or damage.
- A second common cause is damaged wiring or poor connections within the sensor circuit, often resulting from environmental exposure or corrosion.
- Improper installation or previous repairs can lead to sensor misalignment, affecting its readings.
- An ABS control module malfunction is a less common but serious cause that can disrupt the entire braking system.
- Rarely, issues with the vehicle's computer system can cause false readings, triggering the C0171 code.
C0171 Repair Costs
Cost Breakdown by Repair Type
Wheel Speed Sensor Replacement
Replacing the faulty left front wheel speed sensor.
- Total: $100 - $300
- Success rate: 90%
Wiring Repair
Repairing or replacing damaged wiring in the sensor circuit.
- Total: $80 - $150
- Success rate: 85%
Money-Saving Tips for C0171
- 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 C0171 Diagnosis Process
Follow these systematic steps to accurately diagnose C0171. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Inspect wiring and connectors for signs of damage, corrosion, or loose connections (5-10 minutes)
Step 1: Initial visual inspection - Inspect wiring and connectors for signs of damage, corrosion, or loose connections (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve DTCs and freeze frame data to understand the fault context (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve DTCs and freeze frame data to understand the fault context (10-15 minutes).
Step 3: Step 3: Component testing - Utilize a multimeter to test the left front wheel speed sensor for proper voltage and resistance (20-30 minutes)
Step 3: Component testing - Utilize a multimeter to test the left front wheel speed sensor for proper voltage and resistance (20-30 minutes).
Step 4: Step 4: System function test - After repairs, check the ABS system's operation and clear codes using the GeekOBD APP (10-15 minutes)
Step 4: System function test - After repairs, check the ABS system's operation and clear codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Conduct a road test to confirm that the ABS engages correctly under various conditions (15-20 minutes)
Step 5: Road test verification - Conduct a road test to confirm that the ABS engages correctly under various conditions (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: C0171 Code Diagnosis and Repair on a 2012 Chevrolet Silverado
Vehicle: 2012 Chevrolet Silverado, 85,000 miles
Problem: The ABS warning light was on, and the driver noticed reduced braking efficiency.
Diagnosis: After scanning with the GeekOBD APP, the C0171 code was confirmed. A visual inspection revealed frayed wiring.
Solution: Replaced the damaged wiring and the left front wheel speed sensor.
Cost: $250 (including parts and labor)
Result: The ABS warning light turned off, and braking performance was restored.
Case Study 2: Resolving C0171 in a 2015 GMC Sierra
Vehicle: 2015 GMC Sierra, 70,000 miles
Problem: Customer complained of pulsating brake pedal and ABS light activation.
Diagnosis: Diagnostic testing indicated a faulty wheel speed sensor. The GeekOBD APP confirmed the issue.
Solution: Replaced the faulty wheel speed sensor and verified the ABS function.
Cost: $150 (part and labor included)
Result: The ABS system functioned correctly post-repair, improving overall vehicle safety.