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C1171 Infiniti Code - Engine Check Signal

Quick Answer

The C1171 diagnostic trouble code (DTC) for Infiniti vehicles indicates an issue with the engine check signal. Common causes include Faulty engine sensor (such as the crankshaft position sensor or camshaft position sensor), Wiring or connector issues related to the engine sensor, ECM/PCM malfunction. 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 Infiniti indicates Engine Check Signal.
Common causes
Common causes include Faulty engine sensor (such as the crankshaft position sensor or camshaft position sensor), Wiring or connector issues related to the engine sensor, ECM/PCM malfunction.
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 11, 2024
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Code C1171 Infiniti Description

The C1171 diagnostic trouble code (DTC) for Infiniti vehicles indicates an issue with the engine check signal. This code is related to the engine control module (ECM) or powertrain control module (PCM) receiving an abnormal signal from a sensor or system related to the engine's operation. The engine check signal is crucial for monitoring the health and performance of the engine, and any abnormalities in this signal can lead to potential issues with engine performance, fuel efficiency, and emissions.

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

Common Causes of C1171 Infiniti

  1. Faulty engine sensor (such as the crankshaft position sensor or camshaft position sensor).
  2. Wiring or connector issues related to the engine sensor.
  3. ECM/PCM malfunction.
  4. Engine mechanical problem affecting sensor readings.
  5. Software or programming issues with the ECM/PCM.

Symptoms of C1171 Infiniti

  1. Check engine light illuminated on the dashboard.
  2. Engine running rough or misfiring.
  3. Reduced fuel efficiency.
  4. Engine stalling or hesitation during acceleration.
  5. Loss of power while driving.

How to Fix C1171 Infiniti

  1. Diagnose the root cause of the C1171 code by using a diagnostic scanner to retrieve specific error codes and data related to the engine check signal.
  2. Inspect the engine sensors and related wiring for any visible damage or loose connections.
  3. Test the sensors using a multimeter to check for proper resistance and voltage readings.
  4. If a faulty sensor is identified, replace it with a new OEM or high-quality aftermarket sensor.
  5. Clear the DTC and reset the ECM/PCM memory to see if the code reappears, indicating a successful repair.

Cost to Fix C1171 Infiniti

The typical repair costs for addressing a C1171 code on an Infiniti vehicle can vary depending on the specific cause of the issue. In general, the cost of parts such as sensors or wiring harnesses can range from $50 to $200, while labor costs can add an additional $100 to $300. Overall, the total repair cost for this issue may fall in the range of $150 to $500, including parts and labor. It is important to note that these estimates are approximate and can vary based on the location of the repair shop, the vehicle's make and model, and the type of engine involved. Be sure to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate tailored to your specific situation.

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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 C1171 Infiniti Code

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

- Common symptoms include the engine check light illuminating on the dashboard and potential issues with the engine's performance.

2. What are some possible causes of OBDII code C1171 in an Infiniti vehicle?

- Possible causes of code C1171 include a faulty engine check signal circuit, damaged wiring, or a defective engine control module (ECM).

3. How can I diagnose the OBDII code C1171 in my Infiniti?

- To diagnose code C1171, you can use an OBDII scanner to retrieve the specific fault code and then perform a visual inspection of the engine check signal circuit and related components.

4. What are some repair tips for resolving OBDII code C1171 in an Infiniti?

- Repair tips for code C1171 may include checking and repairing any damaged wiring, replacing a faulty engine check signal circuit, or reprogramming the ECM if necessary.

5. Can I drive my Infiniti with OBDII code C1171 present?

- It is generally not recommended to drive your Infiniti with an active OBDII code like C1171, as it can indicate potential issues with the engine that may affect its performance and safety.

6. How serious is OBDII code C1171 in an Infiniti?

- Code C1171 should be addressed promptly as it can impact the engine's performance and potentially lead to more severe issues if left unresolved.

7. Is it safe to clear the OBDII code C1171 in my Infiniti without repairing the issue?

- While clearing the code may temporarily turn off the check engine light, it is important to diagnose and repair the underlying issue causing code C1171 to prevent further problems.

8. Can a DIY enthusiast fix OBDII code C1171 in an Infiniti?

- Depending on your skill level and access to tools, you may be able to address code C1171 yourself by following repair guides and procedures specific to your vehicle.

9. How much does it typically cost to repair OBDII code C1171 in an Infiniti?

- The cost of repairing code C1171 can vary depending on the root cause of the issue, the parts needed for repair, and whether you choose to fix it yourself or seek professional help.

10. Will OBDII code C1171 cause my Infiniti to fail an emissions test?

- Yes, OBDII code C1171 can cause your Infiniti to fail an emissions test as it indicates a problem with the engine that may affect emissions control systems.

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