Engine-Codes - Gmc - P0340 GMC

P0340 GMC Code - Camshaft Position Sensor Circuit

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

|What are the Possible Causes of the P0340 GMC Code?

  • Faulty Camshaft Position Sensor
  • Camshaft Position Sensor harness is open or shorted
  • Camshaft Position Sensor circuit poor electrical connection
  • Faulty starter motor
  • Starting system circuit
  • Dead (Weak) battery

|How to Fix the P0340 GMC Code?

Start by checking 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.

|P0340 GMC code tech notes

On some GMC models, the camshaft position sensor is part Ignition Control Module (ICM) (aka igniter).





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|What is the cost to diagnose the P0340 GMC code?

Labor: 1.0

The cost to diagnose the P0340 GMC 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.

|What are P0340 GMC code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Lack/Loss of Power
  • Engine Stall

|What Does the P0340 GMC Code Mean?

The Camshaft Position Sensor detects magnetic flux changes between the four narrow and wide tooth slots on the reluctor wheel. The Camshaft Position Sensor provides a digital ON/OFF DC voltage of varying frequency for each camshaft revolution. The Engine Control Module (ECM) will recognize the narrow and wide tooth patterns to identify the camshaft position, or which cylinder is in compression, and which is in the exhaust. The information is then used to determine the correct time and sequence for fuel injection and ignition spark events.
The ECM also has a dedicated replicated Camshaft Position Sensor signal output circuit that may be used as an input signal to other modules for monitoring engine RPM.
The Diagnostic Trouble Code (DTC) will be set when the ECM does not receive a signal from the Camshaft Position Sensor during 200 engine revolutions.

Camshaft Position Sensor Circuit

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