VOLVO
TCM-00A1 - Power supply. Voltage too high
System
Transmission Control Module (TCM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsS60 (2001–2009), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (9)
- Volvo S60 (2001–2009)2006–2007Engine B5254T4, D5244T4, D5244T5 only · Transmission TF-80SC, TF-80SC AWD only
- Volvo S60 (2001–2009)2008–2009Engine D5244T4, D5244T5 only · Transmission TF-80SC only
- Volvo V70 (2000–2008)2006–2007Engine B5254T4, D5244T4, D5244T5 only · Transmission TF-80SC, TF-80SC AWD only
- Volvo V70 (2000–2008)2008Engine D5244T5 only · Transmission TF-80SC only
- Volvo V70 XC / XC70 (2001–2007)2006–2007Engine D5244T4 only · Transmission TF-80SC AWD only
- Volvo XC90 (2003–)2006–2007Engine D5244T4 only · Transmission TF-80SC AWD only
- Volvo XC90 (2003–)2008–2010Engine D5244T4, D5244T5 only · Transmission TF-80SC AWD only
- Volvo XC90 (2003–)2011Engine D5244T18, D5244T4, D5244T5 only · Transmission TF-80SC, TF-80SC AWD only
- Volvo XC90 (2003–)2012All engines except: B5254T2, B6324S5 · All transmissions except: AW50/51 AWD
What does this fault code mean?
The transmission control module continuously follows the voltage supplied to itself and checks it against a value from the central electronic module (CEM). The fault means the voltage has become too high.
Possible causes
- A battery charger with the wrong voltage has been used
- Internal fault inside the transmission control unit (TCM)
What you can do
- 1Read off and clear the fault code, road test the car and check whether it comes back
- 2Check that no battery charger is connected; a charger with too high a voltage can cause the fault
- 3Check that the charging system does not produce too high a voltage
- 4Have a workshop check the connectors and the power supply lead to the transmission control module, and diagnose the central electronics if needed
Symptoms you may notice2
- Malfunction indicator lamp (MIL) on
- General warning lamp on
What the fault can affect1
- The control module's auxiliary program is activated
General guidance for car owners. Diagnosis on the car can point to a different cause.