What does fault code ECM-P02523A mean?

Diagnostic fault code details for ECM-P02523A (Volvo S80 (2007–), Volvo V70 (2008–), Volvo XC60 (2009–)). Repair service at OBD Tuning.

VOLVO

ECM-P02523A - Injection Pump Fuel Metering Control A Range/Performance. FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Incorrect has too many pulses

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

5 models

S80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)

Show models by year and engine (6)

What does this fault code mean?

The ECM monitors the injection pump. The fault is set when the control module detects that the PWM signal to the fuel flow control valve is incorrect, for example with too many pulses. It may be caused by loose connections or interference on the signal wire.

Possible causes

Loose connections or contact resistance in the connections on the PWM signal wire
Interference on the PWM signal wire

What you can do

1Read the code, clear it and road test to see whether it returns
2Look at the connectors on the PWM signal wire for loose connections and oxidation
3Look for chafing on the wire to the fuel flow control valve, where interference can occur
4If you have a diagnostic tool: read the fuel flow control valve drive in live data at idle, and see whether the value jumps
5Check that the battery is fully charged and that the earth connections are clean and tight
6If the fault remains, have a workshop check the fuel flow control valve and the PWM signal with diagnostic equipment

Symptoms you may notice2

The car feels poor to drive, with reduced performance and lack of power
The car hesitates, surges or runs jerkily

What the fault can affect1

A calculated value is used instead of the measured one

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