Crankshaft-Camshaft Position Correlation -- Bank 1 (GM)
What does P1345 mean?
The P1345 code means the vehicle's onboard diagnostic system has detected: Crankshaft-Camshaft Position Correlation -- Bank 1 (GM). This is a critical severity code.
Common Symptoms
- Check Engine Light on
- Engine misfiring and rough running
- Hard starting or no start
- Loss of power
- Engine backfiring through intake or exhaust
Probable Causes (Ranked by Likelihood)
- Distributor timing incorrect (distributor-equipped engines) Very High
- Worn timing chain causing excessive slack High
- Failed camshaft position sensor Moderate
- Failed crankshaft position sensor Moderate
- Jumped timing chain or belt Low
Step-by-Step Diagnostic Procedure
-
Check distributor alignment if the engine has a distributor
-
Monitor CKP-CMP correlation data with a scan tool
-
Inspect the timing chain for excessive slack or stretch
-
Test the camshaft and crankshaft position sensors for proper output
-
Perform a timing chain stretch measurement with a scan tool
Frequently Asked Questions
Can I drive with code P1345?
You can drive short distances, but the engine will run poorly. If the timing chain has jumped, continued driving can cause severe engine damage including bent valves.
What causes P1345 on GM?
On older GM V8 engines with a distributor, the most common cause is the distributor being one tooth off. On newer engines, timing chain stretch is the primary cause.
How do I check the distributor timing?
On GM V8 engines with a distributor, remove the cap and verify the rotor is pointing at the correct position. The distributor can rotate slightly over time. Realigning it to the correct position resolves the code.