VOLVO
ECM-P2A0600 - O2 Circuit Negative Voltage (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:
5 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (6)
- Volvo S80 (2007–)2007–2009Engine D5244T4, D5244T5 only
- Volvo V70 (2008–)2008–2009Engine D5244T4, D5244T5 only
- Volvo XC60 (2009–)2009All engines except: B6304T2
- Volvo XC70 (2008–)2008All engines except: B6324S
- Volvo XC70 (2008–)2009Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2013–2014Engine D5244T18, D5244T5 only
What does this fault code mean?
The code concerns the ground wire for the oxygen sensor on bank 1, sensor 1. The engine control module (ECM) checks the sensor's signal ground, and the code is set when it is incorrect.
Possible causes
- Ground wire shorted to voltage
- Damaged oxygen sensor
- Ground wire shorted to ground
- Open circuit in the ground wire
- Contact resistance or oxidation in the connections
What you can do
- 1Read the code with a diagnostic tool and check whether it is active or only stored
- 2Check the connections at the oxygen sensor and at the engine control module for contact resistance, looseness and oxidation
- 3Use a multimeter to check that the ground wire has no break and no contact with positive supply
- 4Have a workshop check the oxygen sensor if the fault remains after the connection check
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.