P2358: Cylinder 10 Pressure Too High

What it means

Cylinder 10 measured peak combustion pressure is above the calibrated maximum — typically pre-ignition, knock, over-fuelling, or runaway combustion.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The engine controller measures peak combustion pressure in cylinder 10 and compares it with a calibrated maximum. This code sets when cylinder 10’s peak pressure is too high, which can be associated with excessive fuel delivery, knock, or abnormal early combustion.

Common causes

Most likely first.

1. Cylinder 10 injector over-delivering fuel
2. Abnormally high combustion pressure
3. Combustion knock or pre-ignition

Symptoms

• Check-engine light
• Engine knock or pinging
• Rough running
• Reduced engine power

How to diagnose it

1. Record freeze-frame data and check live cylinder 10 pressure, knock, and misfire information to establish when pressure rises above the expected range.
2. Listen for knock and note whether it occurs under load, while avoiding repeated acceleration that could worsen the condition.
3. Inspect cylinder 10’s injector connector and wiring for damage or a fault that could affect fuel control.
4. Test cylinder 10 injector delivery and operation using the manufacturer’s procedure to check for over-delivery.
5. If injector checks pass, investigate knock or abnormal combustion causes using manufacturer-specified engine tests.

Common fixes

• Repair a wiring or connector fault affecting cylinder 10 injector control.
• Correct or replace a cylinder 10 injector confirmed to over-deliver fuel.
• Repair the confirmed cause of knock or abnormal combustion in cylinder 10.

Can I keep driving?

Avoid heavy loads and stop driving if loud knocking, severe roughness, or power loss occurs; excessive cylinder pressure can damage engine components. Have the cause checked promptly.