P0340 on Cadillac
Camshaft Position Sensor Circuit Malfunction
P0340 on Cadillac vehicles indicates camshaft position sensor circuit malfunction. Au7o has documented this code across 1 Cadillac model — most commonly on Fleetwood. This code means the engine computer lost or received an erratic signal from the camshaft position sensor. That sensor tells the computer the exact position and speed of the camshaft, which it uses together with the crankshaft sensor to time fuel injection and spark precisely. When the camshaft signal is missing, intermittent, or out of range, the computer sets P0340. Symptoms often include hard starting, stalling, rough running, or a no-start because the engine can't time itself correctly. Typical repair costs on Cadillac range from $400 to $1,000, depending on the specific model and root cause.
Common Causes of P0340
- •Failed camshaft position sensor
- •Corroded or loose sensor connector
- •Damaged or shorted sensor wiring
- •Bad reluctor/tone ring on the camshaft
- •Loose timing chain/belt or jumped timing
- •Metal debris or oil contamination on the sensor tip
- •Poor sensor power or ground supply
- •Faulty PCM/ECM (rare)
P0340 on Cadillac by Model
Cadillac Fleetwood(1 issue)
- LT1 5.7L Optispark Distributor Failure (1994-1996)1994-1996
The 1994-1996 Fleetwood uses the LT1 V8 with the Optispark distributor mounted at the front of the engine behind the water pump. Water intrusion and internal component failure cause no-start conditions and misfires.
Looking for P0340 on a different make?
View P0340 across all makes →Frequently Asked Questions
What does P0340 mean on Cadillac?▼
P0340 stands for "Camshaft Position Sensor Circuit Malfunction." This code means the engine computer lost or received an erratic signal from the camshaft position sensor. That sensor tells the computer the exact position and speed of the camshaft, which it uses together with the crankshaft sensor to time fuel injection and spark precisely. When the camshaft signal is missing, intermittent, or out of range, the computer sets P0340. Symptoms often include hard starting, stalling, rough running, or a no-start because the engine can't time itself correctly. On Cadillac specifically, this code is documented across 1 model.
What causes P0340 on Cadillac vehicles?▼
Common causes on Cadillac: Failed camshaft position sensor, Corroded or loose sensor connector, Damaged or shorted sensor wiring, Bad reluctor/tone ring on the camshaft, Loose timing chain/belt or jumped timing. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0340 on a Cadillac?▼
Repair costs on Cadillac range from $400 to $1,000, depending on the specific model and root cause.
Which Cadillac models have P0340 documented?▼
Au7o has documented P0340 on 1 Cadillac model: Fleetwood.