What does fault code ECM-U300147 mean?

Diagnostic fault code details for ECM-U300147 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo V40 (2013–)). Repair service at OBD Tuning.

VOLVO

ECM-U300147 - Control Module Improper Shutdown. System Internal Failures. Watchdog / safety µC failure

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

8 models

S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)

Show models by year and engine (8)

What does this fault code mean?

The engine control module (ECM) continuously monitors many internal signals through calculations and comparisons to ensure reliability. The code is set when the ECM detects an internal fault in the control module. Some internal signals are then replaced with default values.

Possible causes

Poorly charged battery or corroded connecting cables
Faulty software in the ECM
Damaged engine control module (ECM)

What you can do

1Check the battery and its connections. Look for corrosion, play or oxidation in the connections and at the engine control module connector.
2If the fault is intermittent, it is assessed case by case. If it returns, the engine control module needs replacing.
3For a permanent fault the engine control module needs replacing. Have a workshop carry out the replacement.

Symptoms you may notice2

Low battery or weak electrical power
Dead battery

What the fault can affect1

Some internal signals in the engine control module are replaced with default values

General guidance for car owners. Diagnosis on the car can point to a different cause.