AutoCodes – Generic – C1171

C1171 Code - Engine Check Signal

Quick Answer

The Engine Control Module (ECM) monitors the communication between Vehicle Dynamic Control (VDC) Control Unit or Control Area Network (CAN)-Local Area Network (LAN) Converter (CLC). Common causes include Faulty Vehicle Dynamic Control (VDC) Control Unit, Vehicle Dynamic Control (VDC) Control Unit harness is open or shorted, Vehicle Dynamic Control (VDC) Control Unit 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: C1171 indicates Engine Check Signal.
Common causes: Common causes include Faulty Vehicle Dynamic Control (VDC) Control Unit, Vehicle Dynamic Control (VDC) Control Unit harness is open or shorted, Vehicle Dynamic Control (VDC) Control Unit 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 2,614

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 Aug 20, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1171 Description

OBDII Code C1171 - Engine Check Signal - AutoCodes.com — C1171 Code - Engine Check Signal

What does this mean?

What are the Possible Causes of the DTC C1171?

Faulty Vehicle Dynamic Control (VDC) Control Unit
Vehicle Dynamic Control (VDC) Control Unit harness is open or shorted
Vehicle Dynamic Control (VDC) Control Unit circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC C1171?

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 C1171 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 C1171 code?

Need more information on how to fix the C1171 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1171 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1171 Infiniti — Engine Check Signal
C1171 Nissan — Engine Check Signal

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 C1171 Code

1. What are the common symptoms of OBDII code C1171 (Engine Check Signal)?

The common symptoms of OBDII code C1171 include the check engine light being illuminated on the dashboard and possible engine performance issues.

2. What are the possible causes of OBDII code C1171?

Possible causes of OBDII code C1171 include a faulty engine control module (ECM), damaged wiring or connectors in the engine check signal circuit, or a malfunctioning engine check signal sensor.

3. How can I diagnose OBDII code C1171?

Diagnosing OBDII code C1171 involves using a diagnostic scanner to retrieve the trouble codes, inspecting the engine check signal circuit for any visible damage, and testing the engine check signal sensor for proper functionality.

4. Can I drive my vehicle with OBDII code C1171?

It is not recommended to drive your vehicle with OBDII code C1171 as it can lead to potential engine performance issues and further damage if left unresolved.

5. How can I repair OBDII code C1171?

To repair OBDII code C1171, you may need to replace the engine check signal sensor, repair any damaged wiring or connectors in the circuit, or reprogram the ECM if necessary.

6. Are there any DIY tips for fixing OBDII code C1171?

While diagnosing and repairing OBDII code C1171 may require advanced automotive knowledge and tools, you can start by checking for loose or damaged connections in the engine check signal circuit before seeking professional help.

7. How much does it cost to fix OBDII code C1171?

The cost to fix OBDII code C1171 can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor costs at the repair facility. It's best to get a quote from a trusted mechanic.

8. Can a low battery voltage cause OBDII code C1171 to trigger?

Yes, a low battery voltage can potentially cause OBDII code C1171 to trigger as it may disrupt the communication between the engine check signal sensor and the ECM.

9. Will resetting the check engine light make OBDII code C1171 go away?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing OBDII code C1171 is not addressed, the code is likely to return once the problem is detected again.

10. Is OBDII code C1171 related to emissions control systems?

OBDII code C1171 is not directly related to emissions control systems, but it is important to address and repair the issue to ensure proper engine performance and potentially prevent further damage to emissions components.