VOLVO
ECM-P268300 - Engine Coolant Bypass Valve "A" Control Circuit High. General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (8)
- Volvo S60 (2011–)2014–2015Engine D4204T5 only
- Volvo S80 (2007–)2014–2015Engine D4204T5 only
- Volvo V40 (2013–)2015Engine D4204T14 only
- Volvo V40 Cross Country (2013–)2015Engine D4204T14 only
- Volvo V60 (2011–)2014–2015Engine D4204T5 only
- Volvo V70 (2008–)2014–2015Engine D4204T5 only
- Volvo XC60 (2009–)2014–2015Engine D4204T5 only
- Volvo XC70 (2008–)2014–2015Engine D4204T5 only
What does this fault code mean?
The ECM operates the cooling valves electrically through a vacuum device, and the valves limit the coolant volume near the engine so it warms up faster. The code name refers to the bypass valve, but the condition concerns the connection to the coolant pump relay, which has been shorted to supply voltage.
Possible causes
- Loose connection or oxidation in the connector
- Signal wire shorted to supply voltage
What you can do
- 1Check the connector at the coolant pump relay for loose connections and oxidation
- 2Use a multimeter to check that the signal wire from the relay has no contact with the positive supply
- 3Check the fuses for the coolant pump and the relay
- 4If nothing is found, have a workshop decide whether the fault lies in the wiring or in the relay
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.