The engine control unit (ECU) is one of the most important components in a modern vehicle. When it starts to fail, the symptoms can be subtle or lead to the car not working at all.
Below are the most common signs indicating a faulty ECU.
Clear symptoms of a faulty ECU
- Hard starting or no starting at all
- Multiple and random errors in diagnosis
- OBD communication problems
- Unstable RPM or power limitation
- Motor fan permanently on
- Excessive drinking or smoking
- Problems after flooding, short circuit or reverse power supply
Why does an ECU fail?
- water infiltration
- short circuits in the installation
- responsive design (some models)
- incorrect interventions with tuning tools
- jitters or bumps in the computer area
Recommended solutions
- complete diagnosis
- bench test
- ECU cloning
- IMMO data transfer if the unit is completely dead
- hardware repair (if possible)