What does fault code ECM-P030398 mean?

Diagnostic fault code details for ECM-P030398 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo S80 (2007–)). Repair service at OBD Tuning.

VOLVO

ECM-P030398 - Cylinder 3 Misfire Detected. Component Failures. Component or system over temperature

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

3 models

S60 (2011–), S80 (2007–), V70 (2008–)

Show models by year and engine (9)

What does this fault code mean?

The engine control module (ECM) registers misfires on cylinder 3 that can damage the catalytic converter, and the code is stored after the engine starts. The misfire can make the catalytic converter too hot, and the code shows that cylinder 3 is the one misfiring.

Possible causes

Poor fuel quality, for example summer fuel in winter
Clogged crankcase ventilation
Uneven compression
Incorrectly calculated ethanol content
Damaged VVT unit
Clogged or leaking injection valve

What you can do

1Read the fault codes and trace camshaft-related codes first
2Check that the fuel is the right type for the season and that the fuel level is sufficient
3Check that the crankcase ventilation is not clogged and that the intake system does not leak
4If you have a diagnostic tool: read the misfire counter for cylinder 3 in live data with the engine running and see whether it stands out
5Have a workshop with diagnostic equipment check the injection valve and the VVT unit on cylinder 3, and the compression if needed

Symptoms you may notice5

The engine starts with difficulty
Uneven idle
The engine feels weak and lacks power
The engine jerks or hesitates when driven
The Check engine light lights up or behaves abnormally

What the fault can affect2

Rear oxygen sensor control is switched off
Lambda control is switched off

General guidance for car owners. Diagnosis on the car can point to a different cause.