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Engine-Codes – Generic – P1377

P1377 Code - Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect

Quick Answer

The P1377 diagnostic trouble code indicates that there is an issue with the Ignition Control Module (ICM) Cam Reference Pulse not matching the 4X Reference Pulse. Common causes include Faulty Ignition Control Module, Wiring issues or poor connections between the ICM and the engine control module, Camshaft position sensor 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
P1377 indicates Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect.
Common causes
Common causes include Faulty Ignition Control Module, Wiring issues or poor connections between the ICM and the engine control module, Camshaft position sensor 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 06, 2024
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Code P1377 Description

The P1377 diagnostic trouble code indicates that there is an issue with the Ignition Control Module (ICM) Cam Reference Pulse not matching the 4X Reference Pulse. The ICM is responsible for controlling the ignition timing in the engine, and when these reference pulses do not align correctly, it can lead to misfires, poor engine performance, and potential damage to the engine components. This can result in rough idling, hesitation during acceleration, decreased fuel efficiency, and ultimately engine stalling.

OBDII Code P1377 - Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect
P1377 Code - Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect

Common Causes of P1377

  1. Faulty Ignition Control Module
  2. Wiring issues or poor connections between the ICM and the engine control module
  3. Camshaft position sensor malfunction
  4. Incorrect ignition timing
  5. Engine control module (ECM) malfunction

Symptoms of P1377

  1. Rough idling
  2. Hesitation during acceleration
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Check Engine Light illuminated

How to Fix P1377

  1. Diagnose the issue by using a scan tool to check for the P1377 code and perform a visual inspection of the wiring and connections.
  2. Test the Camshaft position sensor to ensure it is functioning correctly.
  3. Check the ignition timing and adjust if necessary.
  4. Replace the Ignition Control Module if it is found to be faulty.
  5. Clear the code from the ECM memory and road test the vehicle to ensure the issue has been resolved.

Cost to Fix P1377

The cost of repairing a P1377 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing an Ignition Control Module can range from $150 to $300, not including labor costs. Including labor, the total cost may be between $300 and $500. It's important to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model. Additionally, diagnostic time and labor rates can vary, so it's recommended to inquire about these specifics before proceeding with the repair.

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Code P1377 Information for Specific Makes

  • P1377 Audi — Cylinder 8 Ignition Circuit Short To B+
  • P1377 Buick — Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect
  • P1377 Cadillac — Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect
  • P1377 Chevrolet — Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect
  • P1377 GMC — Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect
  • P1377 Volkswagen — Cylinder 8 Ignition Circuit Short To B+
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 P1377 Code

1. What are common symptoms of OBDII code P1377?

- Common symptoms include engine misfires, rough idling, poor acceleration, and potential stalling of the vehicle.

2. What can cause the OBDII code P1377 to trigger?

- The code P1377 is usually triggered by a faulty ignition control module or a problem with the camshaft position sensor.

3. How can I diagnose the cause of OBDII code P1377?

- Diagnosing the issue involves checking the ignition control module, camshaft position sensor, and related wiring for any visible damage or malfunctions.

4. Can a faulty ignition control module cause code P1377?

- Yes, a faulty ignition control module can lead to the triggering of OBDII code P1377 due to incorrect signals being sent to the engine control module.

5. What is the role of the camshaft position sensor in relation to code P1377?

- The camshaft position sensor provides crucial data to the engine control module, and if it malfunctions, it can cause the incorrect pulse to be sent to the 4X reference pulse.

6. Are there any repair tips for addressing OBDII code P1377?

- Repair tips include checking and replacing the ignition control module, camshaft position sensor, and ensuring all related wiring connections are secure and in good condition.

7. Can driving with code P1377 cause further damage to the vehicle?

- Driving with code P1377 may lead to reduced engine performance, potential stalling, and increased fuel consumption, so it's recommended to address the issue promptly.

8. How can I reset OBDII code P1377 after making repairs?

- After making the necessary repairs, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the error code.

9. Is it safe to continue driving with OBDII code P1377 present?

- It is not recommended to continue driving with code P1377 present, as it can lead to further engine issues and potential safety hazards on the road.

10. Can a DIY enthusiast fix OBDII code P1377 at home?

- While some aspects of diagnosing and repairing code P1377 can be done at home by DIY enthusiasts, it may require specialized tools and expertise to accurately identify and address the root cause of the issue.

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