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P0371 Code - Timing Reference High Resolution Signal 'A' Too Many Pulses

- Code Popularity: 15,777 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0371?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Timing Reference Optical Sensor harness is open or shorted
  • Timing Reference Optical Sensor circuit poor electrical connection
  • Faulty Timing Reference Optical Sensor
  • Damaged Powertrain Control Module (PCM)
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How to Fix the DTC P0371?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0371 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

There are too many high resolution pulses from the optical sensor to the PCM

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P0371 Description

The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. The high resolution is one of the most important inputs by the PCM for fuel control and timing. This test monitors the number of high resolution pulses which have been missed (not detected). It's based on a comparison between the number of pulses that were detected since the last pump cam pulse and the number of the pulses that should have occurred. There are approximately 64 high resolution pulses for every cam pulse.

OBDII Code P0371 - Timing Reference High Resolution Signal 'A' Too Many Pulses - AutoCodes.com
P0371 Code - Timing Reference High Resolution Signal 'A' Too Many Pulses

Need More Information on the Code?

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Information for Specific Makes

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Code P0371 comments

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