VOLVO
ECM-852D - 5 volt power supply. Signal too low
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2007Engine B5254T3 only
- Volvo C30 (2007–2013)2008–2013Engine B5254T7 only
- Volvo C70 (2006–2013)2006–2007Engine B5254T3 only
- Volvo C70 (2006–2013)2008–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2005–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo V50 (2004–2013)2005–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
What does this fault code mean?
This code means the voltage to the sensors is too low when the engine control module (ECM) checks it with the ignition on. The wire may be shorted to ground, a sensor may be damaged, or the fault may lie in the control module. This variant differs from the code for high voltage.
Possible causes
- Short to ground in the supply to the sensors
- A sensor is damaged
- The control module is damaged
What you can do
- 1Read the code and check whether it is active with the ignition on
- 2Check the sensor supply wire for chafing and contact with ground; use a multimeter against the body
- 3Check that the sensor connectors are fully engaged and free from oxidation
- 4If you have diagnostic equipment, read the sensor values in live data and see whether any one gives a reading that is too low compared with the others
- 5Repair as needed and road test the car; if the code returns, have a workshop decide whether the control module needs replacing
Symptoms you may notice3
- The engine cranks but does not start
- Poor performance
- The engine is hard to start
General guidance for car owners. Diagnosis on the car can point to a different cause.