VOLVO
ECM-P158977 - Throttle Control Unable To Control To Desired Throttle Angle. Mechanical Failures. Commanded position not reachable
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 B4204T10, B4204T11, B4204T12, B4204T15, B4204T9, D4204T5 only
- Volvo S80 (2007–)2014–2015Engine B4204T11, B4204T12, B4204T15, D4204T5 only
- Volvo V40 (2013–)2015Engine B4204T11, D4204T14 only
- Volvo V40 Cross Country (2013–)2015Engine B4204T11, D4204T14 only
- Volvo V60 (2011–)2014–2015Engine B4204T11, B4204T12, B4204T15, B4204T9, D4204T5 only
- Volvo V70 (2008–)2014–2015Engine B4204T11, D4204T5 only
- Volvo XC60 (2009–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9, D4204T5 only
- Volvo XC70 (2008–)2014–2015Engine B4204T11, D4204T5 only
What does this fault code mean?
The engine control module (ECM) checks that the throttle follows the throttle angle it requests. The code is set when the actual throttle angle differs from the requested one, and it can only be checked in certain driving situations.
Possible causes
- The throttle sticks or is blocked, for example by dirt or ice
- Damaged throttle body
What you can do
- 1If you have a diagnostic tool, read the actual and requested throttle position in live data at idle, and check that they follow each other.
- 2With the ignition off, press the throttle plate gently and check that it does not stick or is not blocked by anything.
- 3Have a workshop clean the throttle body if needed.
- 4If the fault remains, have a workshop check or replace the throttle body.
Symptoms you may notice3
- The idle is uneven
- The engine performs poorly or lacks power
- The check engine lamp lights or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.