VOLVO
CEM-1A61 - Communication with the transmission control module (TCM). Signal missing
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (21)
- Volvo S60 (2001–2009)2001–2002
- Volvo S60 (2001–2009)2003All transmissions except: M58
- Volvo S60 (2001–2009)2004Transmission AW50/51 AWD, AW55-50/51SN only
- Volvo S60 (2001–2009)2005All engines except: D5244T3 · Transmission AW50/51 AWD, AW55-50/51SN only
- Volvo S60 (2001–2009)2006All engines except: D5244T6, D5244T7 · All transmissions except: M58, M66 AWD
- Volvo S60 (2001–2009)2007–2008All engines except: D5244T7 · All transmissions except: M58, M66 AWD
- Volvo S60 (2001–2009)2009All engines except: D5244T7 · All transmissions except: M58
- Volvo S80 (1999–2006)1999–2004
- Volvo S80 (1999–2006)2005–2006All engines except: B6294S2, B6294T · Transmission AW50/51 AWD, AW55-50/51SN only
- Volvo V70 (2000–2008)2000–2002
- Volvo V70 (2000–2008)2003All transmissions except: M58
- Volvo V70 (2000–2008)2004Transmission AW50/51 AWD, AW55-50/51SN only
- Volvo V70 (2000–2008)2005All engines except: D5244T3 · Transmission AW50/51 AWD, AW55-50/51SN only
- Volvo V70 (2000–2008)2006All engines except: D5244T6 · All transmissions except: M58, M66 AWD
- Volvo V70 (2000–2008)2007All engines except: D5244T7 · All transmissions except: M58, M66 AWD
- Volvo V70 (2000–2008)2008All engines except: D5244T7
- Volvo V70 XC / XC70 (2001–2007)2001–2002
- Volvo V70 XC / XC70 (2001–2007)2003–2005Transmission AW50/51 AWD only
- Volvo V70 XC / XC70 (2001–2007)2006–2007Transmission AW50/51 AWD, TF-80SC AWD only
- Volvo XC90 (2003–)2003, 2012–2015
- Volvo XC90 (2003–)2004–2011All transmissions except: M66 AWD
What does this fault code mean?
The central electronic module (CEM) has lost communication with the transmission control module (TCM) and sets this code. The fault lies in the communication, not in the CEM, so the CEM should not be replaced. Without contact with the TCM, gear changes may not happen and a substitute gear is engaged.
Possible causes
- The TCM is not getting power
- The ground wire to the TCM is broken
- Contact resistance in the connections
- Broken CAN wiring to the TCM
- Wrong TCM for this car, for example a used module with different software or hardware
What you can do
- 1Check the TCM fuse. If it has blown, replace it once. If it blows again, use a multimeter to check the wire after it has no contact with ground.
- 2Check that the connectors to the transmission control module are seated and free of corrosion, chafing or damage
- 3Check that the ground wire to the transmission control module is tight and clean. Use a multimeter to check it has no break
- 4If the fault remains, read the module ID with a diagnostic tool
- 5After the work, clear the code and drive the car to check that gear changes work
Symptoms you may notice3
- Gear changes do not happen
- The malfunction indicator lamp (MIL) is lit
- A message appears in the display
What the fault can affect1
- A substitute gear is engaged
General guidance for car owners. Diagnosis on the car can point to a different cause.