AutoCodes – Generic – P1377

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

Quick Answer

The Powertrain Control Module (PCM) has detected an incorrect number of 4X pulses compared to the cam reference- 4X signal is lost. Common causes include Faulty 4X Crankshaft Position (CKP) Sensor, 4X Crankshaft Position (CKP) Sensor harness is open or shorted, 4X Crankshaft Position (CKP) Sensor 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: P1377 indicates Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect.
Common causes: Common causes include Faulty 4X Crankshaft Position (CKP) Sensor, 4X Crankshaft Position (CKP) Sensor harness is open or shorted, 4X Crankshaft Position (CKP) Sensor 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 7,239

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1377 Description

The Powertrain Control Module (PCM) has detected an incorrect number of 4X pulses compared to the cam reference- 4X signal is lost.

OBDII Code P1377 - Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect - AutoCodes.com — P1377 Code - Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect

What does this mean?

What are the Possible Causes of the DTC P1377?

Faulty 4X Crankshaft Position (CKP) Sensor
4X Crankshaft Position (CKP) Sensor harness is open or shorted
4X Crankshaft Position (CKP) Sensor circuit poor electrical connection

How to Fix the DTC P1377?

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 P1377 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 P1377 code?

Need more information on how to fix the P1377 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1377 code diagnosed by a professional: Find a repair shop in your area

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.