VOLVO
ECM-P085086 - Park / Neutral Switch Input Circuit. Bus Signal / Message Failures. Signal invalid
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
14 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)
Show models by year and engine (36)
- 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–)2011Engine B5254T5, B6304T4, D5204T2, D5244T10 only
- Volvo S60 (2011–)2012Engine B5254T5, B6304T4, D5204T3, D5244T11, D5244T15 only
- Volvo S60 (2011–)2013–2014All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T
- Volvo S60 (2011–)2015All engines except: B4164T, B4164T2, B4164T3, D4162T
- Volvo S80 (2007–)2007
- Volvo S80 (2007–)2008–2009All engines except: B4204S3, B4204S4, D4204T
- Volvo S80 (2007–)2010All engines except: B4204S3, B4204S4, B4204T6, D4164T, D4204T
- Volvo S80 (2007–)2011All engines except: B4164T, B4204S3, B4204S4, B4204T6, B4204T7, D4164T
- Volvo S80 (2007–)2012–2014All engines except: B4164T, B4164T2, B4204T6, B4204T7, D4162T
- Volvo S80 (2007–)2015All engines except: B4164T, D4162T
- Volvo V40 (2013–)2013All engines except: B4164T, B4164T3, D4162T
- Volvo V40 (2013–)2014–2015All engines except: B4164T, B4164T3, B4164T4, D4162T
- Volvo V40 Cross Country (2013–)2013–2015All engines except: B4164T, D4162T
- Volvo V50 (2004–2013)2011–2012Engine D5204T, D5204T5 only
- Volvo V60 (2011–)2011Engine B6304T4, D5204T2, D5244T10 only
- Volvo V60 (2011–)2012Engine B6304T4, D5204T3, D5244T11, D5244T15 only
- Volvo V60 (2011–)2013–2014All engines except: B4164T, B4164T2, B4164T3, B4204T7, D4162T
- Volvo V60 (2011–)2015All engines except: B4164T, B4164T2, B4164T3, D4162T
- Volvo V60 Cross Country (2015–)2015
- Volvo V70 (2008–)2008–2009All engines except: B4204S3, B4204S4, D4204T
- Volvo V70 (2008–)2010All engines except: B4204S3, B4204S4, B4204T6, D4164T, D4204T
- Volvo V70 (2008–)2011Engine B5254T10, B5254T11, B6304T4, B6324S5, D5204T2, D5244T10 only
- Volvo V70 (2008–)2012–2014All engines except: B4164T, B4164T2, B4204T7, D4162T
- Volvo V70 (2008–)2015All engines except: B4164T, B4164T2, D4162T
- Volvo XC60 (2009–)2009
- Volvo XC60 (2009–)2010All engines except: B4204T6
- Volvo XC60 (2009–)2011–2012All engines except: B4204T6, B4204T7
- Volvo XC60 (2009–)2013–2015All engines except: B4204T7
- Volvo XC70 (2008–)2008–2015
- Volvo XC90 (2003–)2007–2010Engine B6324S only
- Volvo XC90 (2003–)2011–2012Engine B6324S5 only
- Volvo XC90 (2003–)2013–2014All engines except: B5254T9
What does this fault code mean?
The code means that the engine control module (ECM) does not receive a valid signal for the park and neutral gear positions over CAN. The signal may be missing, wrong or of too poor quality. The fault is a knock-on from the transmission control module (TCM), and it is checked with the ignition on.
Possible causes
- Faulty CAN communication
- The root cause is in the transmission control module (TCM)
- Break in one of the CAN network wires
- Contact resistance or oxidation in the connectors
- One of the CAN network wires is shorted to earth or to voltage
- The CAN network wires are shorted to each other
What you can do
- 1Read the fault codes in the transmission control module (TCM) and remedy them first, as this code is set after the fault there
- 2Erase this fault code only after the TCM fault has been remedied and its fault code erased
- 3Check that the fuses are intact. The locations are shown in the instruction manual or on the fuse list
- 4Check that the connectors on the CAN network are firmly seated and free from oxidation and contact resistance
- 5Use a multimeter to check that the CAN wires have no break and are not shorted to earth, voltage or each other
- 6If the fault remains, have a workshop with diagnostic equipment check the CAN network
Symptoms you may notice3
- The engine does not start and the starter does not crank it, either always or on some occasions
- A clicking sound, or no sound at all, is heard when starting is attempted
- A message and a warning symbol are shown in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.