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Engine-Codes – Generic – C1171

C1171 Code - Engine Check Signal

Quick Answer

The C1171 code indicates an engine check signal, which means that there is a communication error between the engine control module (ECM) and another system in the vehicle. Common causes include Faulty engine control module (ECM), Loose or damaged wiring connections, Malfunctioning sensor (e.g., camshaft position sensor, crankshaft position sensor). 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 engine control module (ECM), Loose or damaged wiring connections, Malfunctioning sensor (e.g., camshaft position sensor, crankshaft position sensor).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code C1171 Description

The C1171 code indicates an engine check signal, which means that there is a communication error between the engine control module (ECM) and another system in the vehicle. This code can affect the vehicle's performance by causing issues such as poor acceleration, rough idling, stalling, or even the inability to start the engine. The engine check signal is crucial for the ECM to monitor and control various functions of the engine, such as fuel injection timing, ignition timing, and emissions control. When this signal is compromised, it can lead to a range of problems that affect the overall performance and efficiency of the vehicle.

OBDII Code C1171 - Engine Check Signal
C1171 Code - Engine Check Signal

Common Causes of C1171

  1. Faulty engine control module (ECM)
  2. Loose or damaged wiring connections
  3. Malfunctioning sensor (e.g., camshaft position sensor, crankshaft position sensor)
  4. Corrosion or damage to electrical connectors
  5. Software malfunction in the ECM

Symptoms of C1171

  1. Check engine light illuminated on the dashboard
  2. Engine running rough or misfiring
  3. Loss of power or acceleration
  4. Engine stalling or difficulty starting
  5. Poor fuel efficiency

How to Fix C1171

  1. Diagnose the issue using a diagnostic scanner to retrieve the specific trouble codes and pinpoint the source of the problem.
  2. Inspect wiring and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the sensors related to the engine check signal to determine if any are faulty. Replace any faulty sensors.
  4. If the issue lies with the ECM, it may need to be reprogrammed or replaced. Consult a professional mechanic for this procedure.
  5. Clear the trouble codes, reset the ECM, and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix C1171

The typical repair costs for addressing the C1171 code can vary depending on the specific cause of the issue and the extent of the repair needed. In general, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $100 to $300. However, it is important to note that the actual repair costs may differ based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. It is recommended to obtain quotes from local auto repair shops to get a more accurate estimate of the total cost. Keep in mind that diagnostic time and labor rates can also impact the overall cost of the repair.

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Code C1171 Information for Specific Makes

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.

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