AutoCodes – GMC – C0171 GMC

C0171 GMC 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 GMC 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.

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Code Popularity 1,406

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0171 GMC Description

The Master Cylinder Isolation Valve, or TCS Prime Valve Solenoid circuits are supplied with battery power when the ignition is in the RUN position. The Electronic Brake Control Module (EBCM) controls the valve functions by grounding the circuit when necessary.

OBDII Code C0171 GMC - TCS Pilot Valve Circuit Malfunction - AutoCodes.com — C0171 GMC Code - TCS Pilot Valve Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC C0171 GMC?

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 GMC?

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 GMC 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C0171 GMC Code

1. What are the common symptoms of OBDII code C0171 GMC (TCS Pilot Valve Circuit Malfunction)?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are some possible causes of OBDII code C0171 GMC?

- Possible causes include a faulty TCS (Traction Control System) pilot valve, damaged wiring or connectors in the circuit, or a problem with the TCS control module.

3. How can I diagnose OBDII code C0171 GMC?

- Diagnosis typically involves using a scan tool to retrieve the specific code, checking the TCS pilot valve circuit for continuity and voltage, and inspecting the wiring and connectors for any visible damage.

4. Can I still drive my vehicle with OBDII code C0171 GMC?

- It is not recommended to drive your vehicle with this code present, as it can lead to performance issues and potential safety concerns. It is best to address the issue promptly.

5. How can I repair OBDII code C0171 GMC?

- Repairing this code may involve replacing the faulty TCS pilot valve, repairing or replacing damaged wiring or connectors, or addressing any issues with the TCS control module.

6. Will resetting the Check Engine Light resolve OBDII code C0171 GMC?

- Simply resetting the Check Engine Light may temporarily turn it off, but it will not fix the underlying issue causing the code. It is important to diagnose and repair the problem to prevent it from recurring.

7. Can a DIYer fix OBDII code C0171 GMC?

- Depending on your level of automotive knowledge and experience, you may be able to address this code yourself by following repair guides or tutorials. However, if you are unsure, it is best to consult with a professional mechanic.

8. How much does it cost to repair OBDII code C0171 GMC?

- The cost of repairing this code can vary depending on the specific cause of the issue, the parts needed for repair, and the labor rates of the mechanic. It is advisable to obtain quotes from different repair shops.

9. Are there any preventive maintenance tips to avoid OBDII code C0171 GMC?

- To help prevent this code, it is recommended to regularly inspect and maintain your vehicle's traction control system, including checking for any signs of wear or damage in the pilot valve circuit.

10. How long does it take to repair OBDII code C0171 GMC?

- The repair time for this code can vary based on the complexity of the issue and the availability of parts. It could take anywhere from a few hours to a day or more to fully diagnose and repair the problem.