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.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Cylinder 10 is numbered according to the manufacturer: check your engine's manual before working on it.
Symptoms
- Check engine light after two trips
- Peak pressure for cylinder 10 frozen at a very high value
- No obvious driveability complaint
Most likely causes
- Signal or low reference wire open, connector pulled off
- Signal or reference shorted to a voltage source
- Sensor electronics driving the output high
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2355 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 3: Ignition and misfires
- 55: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2355?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P2355?
The most common causes are: signal or low reference wire open, connector pulled off; signal or reference shorted to a voltage source; sensor electronics driving the output high.
Related codes
- P2354Cylinder 10 Pressure Sensor Circuit Low
- P2352Cylinder 10 Pressure Sensor Circuit
- P2353Cylinder 10 Pressure Sensor Circuit Range/Performance
- P2356Cylinder 10 Pressure Sensor Circuit Intermittent/Erratic
- P234BCylinder 9 Pressure Sensor Circuit High
- P235FCylinder 11 Pressure Sensor Circuit High
- P0398Cylinder 1 Pressure Sensor Circuit High
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.