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GM-Frank, ASE Master Certified
Category: Chevy
Satisfied Customers: 431
Experience:  37 Years Automotive Diagnosis and Repair. 25 Years of General Motors Dealer Experience
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Why am I getting fault code of P1345 Crankshaft Position (CKP)

Resolved Question:

How do I fix an OBD II fault code of P1345 Crankshaft Position (CKP)-Camshaft Position (CMP) Correlation on a 4.3L V-6 engine?

Submitted: 9 years ago.
Category: Chevy
Expert:  GM-Frank replied 9 years ago.


Couple of quick questions. Are there any other codes stored or just the P1345?

Has there been any recent repair work done on the Engine?

Let me know.

Customer: replied 9 years ago.

That is the only code and the only thing I have done is replaced the spark plugs, spark plug wires, and the distributor rotor and cap. It looked like all the old parts were original. Over 165,000 miles on the engine and still runs great. The service engine light came on before I replaced the parts.

Expert:  GM-Frank replied 9 years ago.

Ok. This code can be set simply because the timing chain has become loose over the miles. At 160,000 that is where I would focus. These things are real bad about Crankshaft Sensors too. See the chart I have loaded at the bottom for you. Tells exactly how to check.

Check the chain and crank sensor first!

You can remove the distributor cap, and while moving the crankshaft by hand, you can take a look at how far the crankshaft is able to move before the distributor begins to move. That is how I personally check this engine. Should only move a few degrees before the distributor rotor moves.

Here are a list of other Diagnostic Aids that you can look at.

The check following items:

  • A loose or missing distributor hold down bolt.
  • A loose CMP sensor causing a variance in the sensor signal.
  • An incorrectly installed distributor-1 tooth OFF in either advance or retard positions.
  • A loose distributor rotor on the distributor shaft.
  • Excessive free play in the timing chain and gear assembly.

An intermittent may be caused by any of the following conditions:

  • A poor connection
  • Rubbed through wire insulation
  • A broken wire inside the insulation. Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent and Poor Connections in Diagrams. If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Diagrams.

Additionally there are some Tests you can perform with a scan tool to check Camshaft Retard Offset. See the Chart Below.


Hope this will give you the information you need.

Thanks and have a great day.

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