C0171 Buick Code - TCS Pilot Valve Circuit Malfunction
Quick Answer
The Master Cylinder Isolation Valve, or TCS Prime Valve Solenoid circuits are supplied with battery power when the ignition is in the RUN position. Common causes include Faulty TCS Pilot Valve Solenoid, TCS Pilot Valve Solenoid harness is open or shorted, TCS Pilot Valve Solenoid 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
- C0171 Buick indicates TCS Pilot Valve Circuit Malfunction.
- Common causes
- Common causes include Faulty TCS Pilot Valve Solenoid, TCS Pilot Valve Solenoid harness is open or shorted, TCS Pilot Valve Solenoid 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 C0171 Buick Description
What are the Possible Causes of the DTC C0171 Buick?
- Faulty TCS Pilot Valve Solenoid
- TCS Pilot Valve Solenoid harness is open or shorted
- TCS Pilot Valve Solenoid circuit poor electrical connection
How to Fix the DTC C0171 Buick?
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 C0171 Buick 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 C0171 Buick Code
1. What does the OBDII code C0171 mean on a Buick?
C0171 indicates a TCS (Traction Control System) Pilot Valve Circuit Malfunction, suggesting an issue with the control or wiring of the valve in the traction system.
2. What are the common symptoms of code C0171 in a Buick?
Common symptoms include the traction control light or ABS light turning on, reduced traction performance, and possible loss of stability control functionality.
3. What causes the C0171 code to appear on a Buick?
The code can be caused by damaged or corroded wiring, a faulty TCS pilot valve, a malfunctioning ABS module, or a poor electrical connection in the circuit.
4. Can I drive my Buick with the C0171 code active?
While the car may still be drivable, traction control and stability features may not function correctly, increasing the risk of losing control in slippery conditions.
5. How do I diagnose a C0171 code on my Buick?
Start by inspecting the wiring and connectors for damage or corrosion. Use a multimeter to test the pilot valve circuit for continuity and check the ABS module for proper operation.
6. How do I fix the C0171 code on a Buick?
Repairs may include replacing damaged wiring, cleaning corroded connectors, replacing the TCS pilot valve, or reprogramming or replacing the ABS module.
7. How much does it cost to repair the C0171 code on a Buick?
The cost depends on the cause. Wiring or connector repairs may cost $100–$300, while replacing the TCS pilot valve or ABS module may range from $300–$1,000.
8. Could a low battery cause the C0171 code on a Buick?
Yes, a low or failing battery can cause electrical issues, potentially triggering the C0171 code. Ensure the battery is fully charged and in good condition.
9. Will clearing the C0171 code fix the issue?
Clearing the code will turn off the warning light temporarily, but if the underlying problem isn’t addressed, the code will likely return.
10. Is the C0171 code specific to Buick vehicles?
No, the code can appear on other vehicles equipped with traction control systems, but the diagnosis and repair steps may vary by make and model.
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