What does fault code ECM-P003000 mean?

Diagnostic fault code details for ECM-P003000 (Volvo C30 (2007–2013), Volvo C70 (2006–2013), Volvo C70 (2006–2013)). Repair service at OBD Tuning.

VOLVO

ECM-P003000 - HO2S Heater Control Circuit (Bank 1, Sensor 1). General Failure Information. No sub type information

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

13 models

C30 (2007–2013), C70 (2006–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)

Show models by year and engine (47)

What does this fault code mean?

The engine control module receives information from the front lambda sensor on bank 1 about the air-fuel mixture and controls the sensor heating. It is a general fault with no more specific description. It is set when the heater signal is incorrect, and it is checked with the ignition on. The code is also set if the signal is too low while the heating is switched off.

Possible causes

Heater wire shorted to supply voltage
Signal wire shorted to ground
Open circuit in the ground wire
Poor contact or oxidation in the connections
Open circuit in the supply from the system relay
Faulty front lambda sensor

What you can do

1Read the code, clear it and road test the car to see whether it returns
2Check the connector at the front lambda sensor for loose or oxidised parts, and do not use rust-release spray or grease in the connector
3Use a multimeter to check that the wires to the lambda sensor have no open circuit and no short to ground or supply voltage
4Have a workshop check the supply voltage from the system relay to the lambda sensor
5If the fault returns: have a workshop try a new lambda sensor

Symptoms you may notice1

Emissions warning lamp lit

What the fault can affect1

Lambda control is switched off

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