P1345 on Buick
Crankshaft Position - Camshaft Position Correlation
P1345 on Buick vehicles indicates crankshaft position - camshaft position correlation. Au7o has documented this code across 1 Buick model — most commonly on Roadmaster. A manufacturer-specific powertrain code; on General Motors vehicles (Chevrolet, GMC, Buick, Cadillac, Pontiac, Saturn, Isuzu) it is set when the signals from the crankshaft position sensor and camshaft position sensor fall out of their expected relationship - commonly cited as roughly 1.5 to 2 percent of crankshaft rotation out of sync. The PCM needs this correlation to time spark and fuel correctly. Symptoms include a check engine light, rough idle or misfire, hard starting, and stalling. On older GM V6/V8 engines this frequently points to a worn timing chain, a real mechanical repair that should not be ignored. Other makes (including Honda, Suzuki and some imports) assign P1345 a different meaning, so confirm the definition for your make before diagnosing. Typical repair costs on Buick range from $600 to $1,500, depending on the specific model and root cause.
Common Causes of P1345
- •Stretched or worn timing chain / failed chain tensioner or guides (very common on higher-mileage GM engines)
- •Faulty camshaft position sensor
- •Faulty crankshaft position sensor or damaged reluctor wheel
- •Loose or improperly seated sensor at its mounting, or wrong sensor installed
- •Damaged wiring, connector corrosion, or shielding fault on either sensor circuit
- •Incorrect ignition/cam timing after recent timing component service
- •Crankshaft position variation relearn not performed after PCM or sensor replacement
P1345 on Buick by Model
Buick Roadmaster(1 issue)
- Optispark (Opti-Spark) distributor failure on the LT11994-1996
The 1994-1996 LT1 uses a camshaft-driven 'Optispark' optical distributor mounted at the front of the engine, low on the timing cover directly behind the water pump. Its optical disc and low-voltage electronics are extremely sensitive to moisture and oil. Any coolant weep from the water pump above it, a failed crankcase vent hose, engine-bay washing, or driving through water can foul the optical sensor and cause misfires. Because it sits behind the water pump, replacement is labor-intensive. This is the single most notorious LT1 (and therefore Roadmaster) driveability failure. The pre-1995 design vented poorly; a vacuum-vented unit arrived for 1995 (B-bodies got the update first).
Looking for P1345 on a different make?
View P1345 across all makes →Frequently Asked Questions
What does P1345 mean on Buick?▼
P1345 stands for "Crankshaft Position - Camshaft Position Correlation." A manufacturer-specific powertrain code; on General Motors vehicles (Chevrolet, GMC, Buick, Cadillac, Pontiac, Saturn, Isuzu) it is set when the signals from the crankshaft position sensor and camshaft position sensor fall out of their expected relationship - commonly cited as roughly 1.5 to 2 percent of crankshaft rotation out of sync. The PCM needs this correlation to time spark and fuel correctly. Symptoms include a check engine light, rough idle or misfire, hard starting, and stalling. On older GM V6/V8 engines this frequently points to a worn timing chain, a real mechanical repair that should not be ignored. Other makes (including Honda, Suzuki and some imports) assign P1345 a different meaning, so confirm the definition for your make before diagnosing. On Buick specifically, this code is documented across 1 model.
What causes P1345 on Buick vehicles?▼
Common causes on Buick: Stretched or worn timing chain / failed chain tensioner or guides (very common on higher-mileage GM engines), Faulty camshaft position sensor, Faulty crankshaft position sensor or damaged reluctor wheel, Loose or improperly seated sensor at its mounting, or wrong sensor installed, Damaged wiring, connector corrosion, or shielding fault on either sensor circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1345 on a Buick?▼
Repair costs on Buick range from $600 to $1,500, depending on the specific model and root cause.
Which Buick models have P1345 documented?▼
Au7o has documented P1345 on 1 Buick model: Roadmaster.