VOLVO
ECM-436C - Leak diagnostic unit. Signal too high
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:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (14)
- Volvo S60 (2001–2009)2005–2006Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo S60 (2001–2009)2008–2009Engine B5204T5, B5244T5, B5254T2 only
- Volvo S80 (1999–2006)2005–2006Engine B5204T5, B5244T4, B5254T2, B6294S2, B6294T only
- Volvo V70 (2000–2008)2005Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2006–2007Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo V70 (2000–2008)2008Engine B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2005All engines except: D5244T
- Volvo V70 XC / XC70 (2001–2007)2006Engine B5244T4, B5254T2 only
- Volvo V70 XC / XC70 (2001–2007)2007Engine B5254T2 only
- Volvo XC90 (2003–)2005–2006Engine B5254T2, B6294T only
- Volvo XC90 (2003–)2007–2012Engine B5254T2 only
- Volvo XC90 (2003–)2013–2014Engine B5254T9 only
- Volvo XC90 (2003–)2015
What does this fault code mean?
The engine control module monitors the pump power consumption during the reference phase. If the current rises above the permitted level, the fault code is set, and the fault can lie in the connector, a clogged filter, a blocked hose between the filter and the unit, or a damaged leak diagnostic unit.
Possible causes
- Contact resistance in the connections
- Clogged filter in the leak diagnostic unit
- Filter-to-unit hose is blocked
- Damaged leak diagnostic unit
What you can do
- 1Have a workshop check the engine control module software on cars of model year 2003 to 2008 before troubleshooting continues
- 2Have you got a diagnostic tool: read the pump current in live data while the leak diagnostic runs and note whether it stays high
- 3Check the leak diagnostic unit connector for contact resistance and oxidation
- 4Have a workshop check the filter in the leak diagnostic unit, since it may be clogged
- 5Look for bent or blocked lines running from the filter to the unit
- 6Have a workshop replace the leak diagnostic unit if the fault remains after these checks
Symptoms you may notice1
- Malfunction indicator lamp (MIL) is on
What the fault can affect1
- The leak diagnostic is disabled
General guidance for car owners. Diagnosis on the car can point to a different cause.