P0340 on Ford
Camshaft Position Sensor Circuit Malfunction
P0340 on Ford vehicles indicates camshaft position sensor circuit malfunction. Au7o has documented this code across 2 Ford models — most commonly on Explorer, Ranger. 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 Ford range from $250 to $4,500, 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 Ford by Model
Ford Explorer(1 issue)
- Timing Chain Cassette and Guide Failure on 4.0L SOHC V62000-2010
The 4.0L SOHC Cologne V6 is notorious for timing chain guide and cassette failures, especially the rear cassette that is difficult to access with the engine installed. Plastic guide material breaks down over time, causing startup rattle, persistent chain noise, cam timing errors, and eventually severe engine damage if the chain jumps timing. This is one of the best-known Explorer engine problems of the era and is documented across owner forums, repair databases, and NHTSA complaints.
Ford Ranger(2 issues)
- Camshaft Synchronizer Chirp and Oil Pump Drive Failure on 3.0L/4.0L V62000-2011
A well-documented issue on late OHV/4.0L Ranger engines is wear of the camshaft synchronizer assembly, which drives the oil pump and provides the cam position signal. Owners commonly report a squeaking or chirping noise from the rear of the engine that is often mistaken for a belt or idler pulley. If ignored, the synchronizer can seize or wear enough to damage the cam sensor and in some cases affect oil pump drive reliability, causing stalling, misfires, or no-start conditions.
- Timing Chain Guide and Cassette Failure on 4.0L SOHC V62001-2011
The 4.0L SOHC V6 is widely known for timing chain guide and cassette wear, especially the rear cassette that is difficult to access. Owners report startup rattle, chain noise at idle, and eventually severe timing errors or engine damage if the plastic guides break apart. Because one chain assembly is at the rear of the engine, repair labor is high and many trucks end up needing engine removal or replacement.
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View P0340 across all makes →Frequently Asked Questions
What does P0340 mean on Ford?▼
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 Ford specifically, this code is documented across 2 models.
What causes P0340 on Ford vehicles?▼
Common causes on Ford: 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 Ford?▼
Repair costs on Ford range from $250 to $4,500, depending on the specific model and root cause.
Which Ford models have P0340 documented?▼
Au7o has documented P0340 on 2 Ford models: Explorer, Ranger.