Engine Cylinder Pressure Out of Range
The pressure in one or more engine cylinders is not within expected limits.
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)
Inside the engine, every cylinder needs to maintain a specific pressure while it runs. If one cylinder's pressure is too high or too low, it can mean trouble, like a leak or a blocked intake or exhaust.
What the computer is actually seeing
The ECU is monitoring cylinder pressure via sensors. Normal readings are expected around 300 to 600 psi during compression based on engine design. Values outside this range trigger the SPN 5462 code.
What a healthy reading looks like
Cylinder pressure readings should be between 300-600 psi during the compression stroke, depending on the engine type and condition.
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.
- 1Check the engine's oil level and coolant level to ensure proper operation.
- 2Inspect wiring and connector for the cylinder pressure sensor, looking for frays or bad connections.
- 3Test cylinder pressure using a mechanical gauge. Values should be between 300-600 psi.
- 4If pressure is out of range, perform a leak-down test to diagnose where the leak is occurring—piston rings, valves, or head gasket.
- 5If readings are good, check the cylinder pressure sensor output with a multimeter, ensuring it matches the expected range.
Common causes
- Worn piston rings
- Blown head gasket
- Clogged intake or exhaust valves
- Faulty cylinder pressure sensor
- Incorrectly adjusted valve lash
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I continue to drive the vehicle?
It's not recommended as low cylinder pressure can lead to further damage.
Will this code come back after repairs?
If the underlying issue is fixed properly, the code should not return.
Why do I see this code together with SPN 5461?
SPN 5461 relates to overall engine performance issues, which can be directly affected by cylinder pressure readings.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →