VOLVO
ECM-P21004B - Throttle Actuator Control Motor Circuit /Open. System Internal Failures. Over temperature
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (6)
- Volvo S80 (2007–)2007–2009Engine D5244T4, D5244T5 only
- Volvo V70 (2008–)2008–2009Engine D5244T4, D5244T5 only
- Volvo XC60 (2009–)2009All engines except: B6304T2
- Volvo XC70 (2008–)2008All engines except: B6324S
- Volvo XC70 (2008–)2009Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2013–2014Engine D5244T18, D5244T5 only
What does this fault code mean?
The engine control module has registered that the throttle unit is too hot. The fault counts as an internal system fault and is checked with the ignition on. The code concerns the temperature reading rather than the control signal itself.
Possible causes
- Overheated throttle unit
What you can do
- 1Read the code with the ignition on and check whether it is still active
- 2Check that the connectors at the throttle unit and the engine control module are secure and free from oxidation
- 3Look for external damage to the throttle unit and to the wiring leading to it
- 4Check that nothing is blocking the throttle unit, such as dirt or an object
- 5If the code returns, have a workshop with diagnostic equipment check the throttle unit and the engine control module
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.