P0340 on Jeep
Camshaft Position Sensor Circuit Malfunction
P0340 on Jeep vehicles indicates camshaft position sensor circuit malfunction. Au7o has documented this code across 4 Jeep models — most commonly on Commander, Compass, Liberty. 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 Jeep range from $100 to $2,500, 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 Jeep by Model
Jeep Commander(1 issue)
- Engine Stalling / Loss of Power While Driving2006-2010
The Commander can stall or lose engine power without warning at any speed. The problem is linked to multiple causes: faulty crankshaft position sensor, failing fuel pump, PCM software bugs, and throttle body issues. Over 173 engine complaints were filed for the 2006 model year. Some owners report engine compartment fires linked to electrical shorts in the PCM area.
Jeep Compass(1 issue)
- Crankshaft / Camshaft Position Sensor Connector Terminals — Intermittent Stall with No Warning (Recall 16V907 / S99)2016
2016 Compass and Patriot built May 9 - July 15, 2016 with the 2.0L or 2.4L World Engine received crankshaft and camshaft position sensor connectors with improperly manufactured terminals. The intermittent connection drops the crank/cam signal and the engine stalls — often without a check-engine light or stored code, which owners on the Patriot forum describe as sudden power loss with the dash going dark then relighting. About 43,000 vehicles across Journey/Compass/Patriot were involved.
Jeep Liberty(1 issue)
- Crankshaft Position Sensor / Reference Signal Loss - Stalling While Driving and Intermittent No-Start2002-2012
Libertys of both generations lose the crank reference signal to the PCM, setting P0320 and shutting the engine off without warning - owners describe the vehicle simply dying at speed, sometimes restarting immediately and sometimes not for hours, and often producing a limp-mode condition. The fault is heat-sensitive, so it typically appears after the engine is warmed and is hard to reproduce cold at a shop. The forum record contains a real diagnostic warning: on Chrysler powertrains, crank and cam sensor codes are misleading, and the failure is frequently in the connector or the harness (oil-contaminated pins, chafed wiring) or in the PCM rather than in the sensor itself - multiple owners report P0320 returning immediately after a new sensor. Stalling in traffic makes this a safety issue, not just a driveability complaint.
Jeep Wrangler(1 issue)
- OPDA/Camshaft Synchronizer Failure Causing Squeal and Cam Gear Wear2005-2006
Late-TJ 4.0L Wranglers are well known for Oil Pump Drive Assembly (OPDA) failures, often described by owners as the 'screaming monkey' chirp or squeal from the engine bay. The OPDA can bind or wear internally, which may damage the camshaft gear and affect oil pump drive timing. If ignored, the issue can escalate from noise and check-engine lights to expensive internal engine repair.
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View P0340 across all makes →Frequently Asked Questions
What does P0340 mean on Jeep?▼
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 Jeep specifically, this code is documented across 4 models.
What causes P0340 on Jeep vehicles?▼
Common causes on Jeep: 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 Jeep?▼
Repair costs on Jeep range from $100 to $2,500, depending on the specific model and root cause.
Which Jeep models have P0340 documented?▼
Au7o has documented P0340 on 4 Jeep models: Commander, Compass, Liberty, Wrangler.