What does fault code ECM-P123811 mean?

Diagnostic fault code details for ECM-P123811 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo V40 (2013–)). Repair service at OBD Tuning.

VOLVO

ECM-P123811 - Fuel Pump Secondary Circuit (Fuel Pump Driver Module). General Electrical Failures. Circuit short to ground

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

8 models

S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)

Show models by year and engine (8)

What does this fault code mean?

The code is set when the engine control module (ECM) finds an electrical fault in the internal circuit that controls the fuel flow and fuel pressure control valves. Here the fault is a short circuit to ground in that circuit.

Possible causes

Open circuit or short circuit to supply voltage
Open circuit or short circuit on the ground wire
Fuel pressure control valve is damaged
Fuel flow control valve is damaged
The code may be caused by a damaged fuse
The engine control module (ECM) itself is faulty

What you can do

1Check that the fuses are intact, since a damaged fuse can cause this code
2Clear the code and road test to see whether it returns
3Check the connectors to the fuel pressure control valve and the fuel flow control valve for contact resistance and oxidation
4Look at the wires to the valves for breaks and chafing
5If you find no fault: have a workshop check the valves, the circuit and the engine control module

Symptoms you may notice4

Unusual noise while driving, either occasionally or all the time
Uneven idle
The engine stalls at idle, either occasionally or all the time
The engine stalls at steady speed

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