What does fault code ECM-P111800 mean?

Diagnostic fault code details for ECM-P111800 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo V40 (2013–)). Repair service at OBD Tuning.

VOLVO

ECM-P111800 - Manifold Air Temperature Circuit Low. 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 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 air temperature sensor in the intake pipe, downstream of the EGR inflow, measures the temperature of the intake air. The engine control module checks the sensor's DC voltage and sets the code when the value is wrong for too long. The fault is checked with the engine running, and while it is active a calculated value is used instead.

Possible causes

Break in the signal wire
Signal wire shorted to earth
Damaged intake temperature sensor

What you can do

1Check that the fuses are intact. The locations are shown in the instruction manual or on the fuse list
2Check that the connector at the air temperature sensor in the intake pipe is firmly seated and free from looseness, contact resistance and oxidation
3Use a multimeter to check that the signal wire to the sensor has no break and is not shorted to earth (the body)
4Read off the fault code with the engine running and check whether it is still active
5If the fault remains after these checks, have a workshop investigate the sensor

Symptoms you may notice1

The check engine lamp lights or behaves abnormally

What the fault can affect1

A calculated value is used instead of the sensor's value

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