AutoCodes – Chevrolet – C0171 Chevrolet

C0171 Chevrolet 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 Chevrolet 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 1,355

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

What does this mean?

What are the Possible Causes of the DTC C0171 Chevrolet?

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 Chevrolet?

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 Chevrolet 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.

Need more information about the C0171 Chevrolet code?

Need more information on how to fix the C0171 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0171 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Code

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

Common symptoms include rough idling, decreased fuel efficiency, and a noticeable drop in engine performance.

2. What are potential causes of the TCS Pilot Valve Circuit Malfunction code?

Potential causes may include a faulty TCS pilot valve, wiring issues, vacuum leaks, or a problem with the engine's air intake system.

3. How can I diagnose the TCS Pilot Valve Circuit Malfunction in my Chevrolet?

Diagnosing this code typically involves performing a thorough inspection of the TCS pilot valve and associated wiring, as well as conducting tests to check for vacuum leaks and air intake system problems.

4. Can a TCS Pilot Valve Circuit Malfunction be repaired at home?

Depending on the cause of the code, some repairs may be possible at home, such as replacing a faulty TCS pilot valve or addressing simple wiring issues. However, more complex issues may require professional assistance.

5. Is it safe to continue driving my Chevrolet with the C0171 code?

It is not recommended to continue driving with this code present, as it can lead to further damage to the engine and potentially compromise vehicle safety. It is best to address the issue promptly.

6. How much does it typically cost to repair the TCS Pilot Valve Circuit Malfunction in a Chevrolet?

The cost of repairs can vary depending on the specific cause of the code and the labor rates in your area. It's advisable to get a diagnostic assessment from a trusted mechanic for an accurate estimate.

7. Can resetting the OBDII system clear the C0171 code?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause of the problem.

8. Are there any preventive measures to avoid the TCS Pilot Valve Circuit Malfunction in the future?

Regular maintenance, such as checking for vacuum leaks, ensuring proper airflow, and promptly addressing any engine performance issues, can help prevent the occurrence of this code in the future.

9. Will the TCS Pilot Valve Circuit Malfunction code cause my Chevrolet to fail an emissions test?

Yes, this code can cause your vehicle to fail an emissions test, as it indicates a problem with the engine's air/fuel mixture and emissions control system.

10. How long does it typically take to repair the TCS Pilot Valve Circuit Malfunction in a Chevrolet?

The repair time can vary depending on the specific issue causing the code and the availability of parts. Simple repairs may take a few hours, while more complex issues could require a day or more to resolve.