P1345 — Crankshaft/Camshaft Position Correlation

What P1345 means

This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).

What P1345 means on specific makes

Chevy / GMC / Cadillac / Buick CAUTION

The crank and cam position signals are out of sync (correlation error). On GM V6/V8 this points to cam timing being off, a failed cam/crank sensor, or a worn timing chain/components. Can cause rough running, hard start, or no-start.

1. Failed cam or crank position sensor ($30-150)
2. Worn timing chain / jumped timing ($300-1500)
3. Wiring fault ($20-150)
4. Slipped reluctor ($varies)

Check first: Compare cam vs crank signal correlation on a scope; if sensors are good, suspect a stretched/jumped timing chain.

Mazda CAUTION

The PCM isn't receiving the camshaft position / cylinder-ID signal. Without cam-position sync the engine can mis-time spark/fuel, causing hard start, stall, or misfire.

1. Failed camshaft position sensor ($50-150)
2. Reluctor/tone-ring or timing issue
3. Wiring/connector fault

Check first: Scan/scope the CMP signal during cranking; replace the sensor if no/erratic signal. Check timing components if the sensor is good.

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