VOLVO
ECM-P21001D - Throttle Actuator Control Motor Circuit /Open. General Electrical Failures. Circuit current out of range
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 drives the throttle motor through internal power stages. The code is set when the module detects a fault in that control, where the current to the throttle motor is outside its normal range. The fault belongs to the electrical control of the throttle unit.
Possible causes
- Open circuit in the signal wire to the throttle motor
- The signal wires are short-circuited
- Damaged throttle unit
What you can do
- 1Check that the fuses for the engine control system are intact
- 2Read the code, note it, clear it and test drive to see whether it returns
- 3Check the connectors at the throttle unit and at the engine control module for loose connections, corrosion and oxidation
- 4Look for chafing, pinching and breaks in the wiring to the throttle unit, and use a multimeter to confirm it has no contact with ground or supply voltage
- 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.