P2349 Cylinder 9 Pressure Sensor Circuit Range/Performance
P2349 is the plausibility code for the combustion pressure sensor of cylinder 9: the signal is electrically valid but does not match what the ECM expects for the operating point. CARB requires input sensors to be checked for rationality where feasible, in both directions. A natural test point is overrun, when no fuel burns and the peak pressure should match the pure compression pressure; GM's European diesel in the Saab 9-5 already uses that peak to locate top dead centre. No manufacturer publishes this cylinder-9 code; its counterpart for cylinder 1 is P0396. Likely causes are carbon on the sensing element, a leaking glow plug seat or a plug fitted with the wrong torque, which detunes the sensor. The ECM ignores the signal, and the driver hardly notices anything.
Likely causes
Symptoms
- Check engine light on
- Usually no noticeable driveability change
Repair estimate
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
Related codes
References: law.cornell.edu, borgwarner.com, saabwisonline.com.