VOLVO
ECM-U010100 - Lost communication with Transmission Control Module (TCM). General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
12 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (17)
- Volvo C30 (2007–2013)2011–2013Engine D5204T, D5204T5 only
- Volvo C70 (2006–2013)2011Engine D5204T, D5204T5 only
- Volvo C70 (2006–2013)2012–2013All engines except: B5254T7
- Volvo S40 (2004–2013)2011–2012Engine D5204T, D5204T5 only
- Volvo S60 (2011–)2012–2013Engine D4162T only
- Volvo S60 (2011–)2014–2015Engine D4162T, D4204T5 only
- Volvo S80 (2007–)2012–2013Engine D4162T only
- Volvo S80 (2007–)2014–2015Engine D4162T, D4204T5 only
- Volvo V40 (2013–)2015Engine D4204T14 only
- Volvo V40 Cross Country (2013–)2015Engine D4204T14 only
- Volvo V50 (2004–2013)2011–2012Engine D5204T, D5204T5 only
- Volvo V60 (2011–)2012–2013Engine D4162T only
- Volvo V60 (2011–)2014–2015Engine D4162T, D4204T5 only
- Volvo V70 (2008–)2012–2013Engine D4162T only
- Volvo V70 (2008–)2014–2015Engine D4162T, D4204T5 only
- Volvo XC60 (2009–)2014–2015Engine D4204T5 only
- Volvo XC70 (2008–)2014–2015Engine D4204T5 only
What does this fault code mean?
The engine control module (ECM) receives information about requested torque from the transmission control module (TCM) over the CAN network. The code is set when communication with the TCM stops, and it is stored in the engine control module.
Possible causes
- Fault in the transmission control module (TCM)
- Open circuit in one of the CAN wires
- Short circuit between the CAN wires
- Contact resistance or oxidation in the terminals and connections
- The engine control module is not intended for the car, for example a used module with other software or hardware
- The software has not been upgraded
What you can do
- 1Read the codes also in the transmission control module (TCM) and in the central electronic control module (CEM), since they may show where the fault is
- 2Check the connectors at the engine control module and the transmission control module for contact resistance and oxidation
- 3Use a multimeter to check that the CAN wires between the engine control module and the transmission control module have no break or short
- 4If you have a diagnostic tool: clear the code and check whether it is set again after a test drive
- 5Have a workshop download new software to the engine control module or the transmission control module if needed
Symptoms you may notice4
- The automatic gearbox shifts hard or jerkily, both when upshifting and downshifting
- The automatic gearbox shifts hard or jerkily when a gear is engaged from standstill
- Cruise control does not engage
- Check engine light comes on or behaves abnormally
What the fault can affect2
- Torque requests from the transmission control module (TCM) are no longer used by the ECM
- Gear shifting quality becomes poor
General guidance for car owners. Diagnosis on the car can point to a different cause.