Cylinder Pressure Sensor Fault
There’s a problem with the cylinder pressure sensor signal.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The cylinder pressure sensor measures the pressure inside the combustion chamber. If this sensor fails, the computer can't correctly monitor engine performance, which can lead to poor fuel economy and higher emissions.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal from the cylinder pressure sensor that typically ranges between 0.5 to 4.5 volts, correlating to the pressure inside the cylinder. Failure means it sees an out-of-range voltage or no signal at all.
What a healthy reading looks like
Normal cylinder pressure readings should be around 1500-3000 psi under load, translating to a sensor output voltage of about 1-4 volts, depending on the specific system and design.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the cylinder pressure sensor wiring for any physical damage or corrosion. Repair as needed. Decision point: Is wiring intact? If no, fix the wiring and retest.
- 22. Measure the voltage output from the cylinder pressure sensor at the ECM connector. It should read between 0.5-4.5 volts. Decision point: Is the voltage within range? If no, replace the cylinder pressure sensor.
- 33. Inspect the connector for the cylinder pressure sensor. Look for dirt, moisture, or corrosion. Clean or replace if necessary. Decision point: Is the connector clean and secure? If no, repair or replace and retest.
- 44. If issues persist, check the engine oil level and quality, as oil contamination can cause sensor issues. Decision point: Is the oil clean and at the proper level? If no, change oil and filter and retest.
Common causes
- Failed cylinder pressure sensor
- Wiring issues (shorts, opens)
- Connector corrosion or damage
- Oil contamination
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity implies you can drive it, but performance might degrade and emissions could increase, so fix soon.
Will this code come back after clearing?
If the underlying issue isn’t fixed (like a bad sensor or wiring), it will likely come back.
Why does this code pair with others like SPN 3216?
Codes often pair due to shared systems or components; in this case, they might relate to pressure sensing failures impacting engine management.
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