What does fault code ECM-P066400 mean?

Diagnostic fault code details for ECM-P066400 (Volvo S80 (2007–), Volvo S80 (2007–), Volvo S80 (2007–)). Repair service at OBD Tuning.

VOLVO

ECM-P066400 - Intake Manifold Tuning Valve Control Circuit Low - Bank 2. 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 code concerns the control valve in the variable intake system on bank 2. The ECM monitors the control signal to the damper, and the code is set when that signal is missing or too low.

Possible causes

Poor contact or oxidation at the connector contacts
Open circuit in the signal wire
Open circuit in the supply or ground wire
Signal wire shorted to ground
Supply wire shorted to ground
Damaged damper actuator

What you can do

1Check that the fuses are intact and that the relevant functions of the car work
2With the ignition off, check the connectors to the control valve for contact resistance and oxidation
3Use a multimeter to check that the signal wire has no open circuit and is not shorted to ground, and that the supply and ground wires are intact
4If you have diagnostic equipment, activate the control valve and listen for a clicking sound
5If the wiring is intact but the fault remains, have a workshop check the damper actuator

Symptoms you may notice3

The malfunction indicator lamp lights up
The car lacks power and performs poorly, especially at take-off
The engine hesitates or surges during acceleration, during deceleration or at steady speed

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