What does fault code ECM-P260087 mean?

Diagnostic fault code details for ECM-P260087 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo V40 (2013–)). Repair service at OBD Tuning.

VOLVO

ECM-P260087 - Coolant Pump "A" Control Circuit/Open. Bus Signal / Message Failures. Missing message

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 engine control module (ECM) communicates with the electric coolant pump over the LIN bus and monitors that communication. The code is set when there is an open circuit on the wire between the control module and the pump, either on the LIN bus or in the power supply. The fault shows up as uneven temperature, and the pump then runs at full speed.

Possible causes

Communication fault on the LIN bus
Contact resistance, oxidation or a break in the connections
Open circuit in the signal ground wire

What you can do

1Check that the fuses are intact
2Check the connectors to the coolant pump for contact resistance, oxidation and breaks
3Follow the signal ground wire to the pump and look for a break with a multimeter
4If you have a diagnostic tool: see whether the code is active now or only stored, and when it last occurred
5If the fault remains, have a workshop check the LIN communication to the coolant pump

Symptoms you may notice1

Temperature control works unevenly

What the fault can affect1

The coolant pump runs at full speed

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