AutoCodes – Cadillac – C0171 Cadillac

C0171 Cadillac 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 Cadillac 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 1,297

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

What does this mean?

What are the Possible Causes of the DTC C0171 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

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

- Common symptoms include engine misfires, rough idling, poor fuel economy, and a noticeable decrease in engine performance.

2. What are the possible causes of the TCS Pilot Valve Circuit Malfunction code in a Cadillac?

- Possible causes include a faulty TCS pilot valve, damaged wiring or connectors in the circuit, a malfunctioning TCS control module, or a vacuum leak in the system.

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

- Diagnosis typically involves using an OBDII scanner to retrieve the trouble code, visually inspecting the TCS components and wiring, and conducting circuit tests to identify the specific issue.

4. Can I still drive my Cadillac with the C0171 code present?

- It is not recommended to drive your Cadillac with the TCS Pilot Valve Circuit Malfunction code present, as it can lead to further damage to the engine and other components. It's best to address the issue promptly.

5. How can I repair the TCS Pilot Valve Circuit Malfunction in my Cadillac?

- Repair methods may include replacing the faulty TCS pilot valve, repairing damaged wiring or connectors, resetting the TCS system, or reprogramming the TCS control module.

6. Will resetting the trouble code make the issue go away permanently?

- Resetting the trouble code may temporarily clear the warning light, but it will not fix the underlying issue causing the TCS Pilot Valve Circuit Malfunction. It's important to diagnose and repair the problem to prevent it from recurring.

7. Is it possible to prevent the TCS Pilot Valve Circuit Malfunction in my Cadillac?

- Regular maintenance, including checking for vacuum leaks, inspecting wiring components, and keeping the TCS system in good condition, can help prevent the occurrence of the TCS Pilot Valve Circuit Malfunction.

8. Can a DIY enthusiast repair the TCS Pilot Valve Circuit Malfunction in a Cadillac?

- Depending on your level of automotive expertise, you may be able to perform basic inspections and repairs related to the TCS system. However, complex issues may require professional diagnosis and repair.

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

- The repair time can vary based on the specific cause of the issue. Simple fixes like replacing a faulty TCS pilot valve may take a few hours, while more complex repairs involving wiring or module replacement could take longer.

10. Are there any safety concerns associated with the TCS Pilot Valve Circuit Malfunction in a Cadillac?

- While the TCS Pilot Valve Circuit Malfunction itself may not pose immediate safety risks, driving with reduced engine performance and potential misfires can impact vehicle handling and overall safety. It's best to address the issue promptly.