P2355 code meaning
Cylinder 10 Pressure Sensor Circuit High
Powertrain system Generic code P23xx codes Check engine light
What P2355 means
P2355 means the cylinder 10 pressure signal is stuck above its upper limit. Taking the Saab 9-5 diesel with GM's 2.0 engine as the model, the Type B high codes for its four cylinders (P0398 on cylinder 1) wait until the signal has stayed above the threshold for over 2 s with the engine running. An interrupted signal or low reference circuit lets the input float upward, and the scan tool then displays a fixed 10,000 kPa instead of a value inside the normal 0 to 9,000 kPa. Saab's way to tell wiring from sensor: bridge signal and low reference at the harness plug with a fused jumper; the reading must then fall below 50 kPa, otherwise the fault lies in the harness or the ECM. No manufacturer documents P2355 for cylinder 10 itself; P2354 is the low counterpart.
P2355 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2355
- Check engine light after two trips
- Peak pressure for cylinder 10 frozen at a very high value
- No obvious driveability complaint
Common causes of P2355
- Most likelySignal or low reference wire open, connector pulled off
- PossibleSignal or reference shorted to a voltage source
- Less likelySensor electronics driving the output high
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cylinder pressure sensor glow plugSensor wiringEngine control module
What each part of P2355 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 55 | The exact fault in that area. |
What to do next
- Note P2355 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2355
What does P2355 mean?
P2355 means "Cylinder 10 Pressure Sensor Circuit High". P2355 means the cylinder 10 pressure signal is stuck above its upper limit. It is a generic code, so it means the same on every make.
Is it safe to drive with P2355?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2355 fail an emissions test?
Yes, it can. P2355 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2355 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3.5 hours of work. This is a job for a workshop.
Will P2355 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.