What does fault code ECM-P015100 mean?

Diagnostic fault code details for ECM-P015100 (Volvo S80 (2007–), Volvo S80 (2007–), Volvo S80 (2007–)). Repair service at OBD Tuning.

VOLVO

ECM-P015100 - O2 Circuit Low Voltage (Bank 2, 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 models

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

Show models by year and engine (13)

What does this fault code mean?

The engine control module (ECM) measures the oxygen content in the exhaust before the catalytic converter using the front oxygen sensor in bank 2. The control module checks the sensor's direct voltage, and the code is set if an incorrect value lasts for a while. The code is only set if the fault has been present over two or more driving cycles in a row.

Possible causes

Contact resistance and oxidation in the connections
Signal wire shorted to ground
Open circuit in the signal wire
Damaged front oxygen sensor in bank 2

What you can do

1Read the code, clear it and road test the car to see whether it comes back
2Check the connectors at the front sensor in bank 2 for contact resistance and oxidation; do not use rust solvent spray or grease
3Use a multimeter to check that the signal wire has no open circuit and is not shorted to ground
4If the connectors and wire are intact, replace the front oxygen sensor in bank 2

Symptoms you may notice2

Malfunction indicator light (MIL) on
Poor performance

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