VOLVO
ECM-P0A0900 - DC/DC Converter Status Circuit Low. 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:
9 modelsC30 (2007–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V70 (2008–)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2011–2013Engine D4162T only
- Volvo S40 (2004–2013)2011–2012Engine D4162T only
- Volvo S60 (2011–)2011–2015Engine D4162T only
- Volvo S80 (2007–)2012–2015Engine D4162T only
- Volvo V40 (2013–)2013–2015Engine D4162T only
- Volvo V40 Cross Country (2013–)2013–2015Engine D4162T only
- Volvo V50 (2004–2013)2011–2012Engine D4162T only
- Volvo V60 (2011–)2011–2015Engine D4162T only
- Volvo V70 (2008–)2012–2015Engine D4162T only
What does this fault code mean?
The code concerns the status circuit of the DC/DC converter, the internal voltage converter that, among other things, supplies the piezo injectors. The engine control module sets the code when the voltage is too low, and the fault is checked with the engine running.
Possible causes
- Battery voltage too low
- Fault in the charging system
- Damaged system relay
- Damaged engine control module
What you can do
- 1Check that the battery is in good condition and that the charging system works
- 2Check that the fuses are intact. The locations are shown in the instruction manual or on the fuse list
- 3Read off the fault code, erase it and restart the engine to see whether it returns
- 4Check that the system relay is not damaged and that its connections are firmly seated
- 5Have a workshop investigate the voltage converter and the engine control module. Do not work on them yourself
Symptoms you may notice4
- The check engine lamp lights or behaves abnormally
- The engine does not start, or the starter drags it round without it starting
- The engine is hard to start and cranks slowly, either always or on some occasions
- The engine is hard to start and cranks slowly when cold or after use
General guidance for car owners. Diagnosis on the car can point to a different cause.