AutoCodes - Mercedes-benz - P0374 MERCEDES-BENZ

P0374 MERCEDES-BENZ Code - Timing Reference High Resolution Signal 'A' No Pulses

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3
Table of contents

|P0374 MERCEDES-BENZ code possible 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)

|How do I fix the P0374 MERCEDES-BENZ code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Cost of diagnosing the P0374 MERCEDES-BENZ code

Labor: 1.0

The cost of diagnosing the P0374 MERCEDES-BENZ code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0374 MERCEDES-BENZ code detected?

There are no high resolution pulses from the optical sensor to the PCM

|What are P0374 MERCEDES-BENZ code possible symptoms?

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

|P0374 MERCEDES-BENZ code 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 P0374 Mercedes-benz - Timing Reference High Resolution Signal 'A' No Pulses -

|Need more information with the P0374 MERCEDES-BENZ code?

Need more information on how to fix the P0374 MERCEDES-BENZ code? Get Access to Factory Service Manuals

|Need help with a P0374 MERCEDES-BENZ code?

Get the P0374 Mercedes-benz code diagnosed by a professional: Find a repair shop in your area

|P0374 MERCEDES-BENZ code comments

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