7101853C1 | Genuine Bosch® ECU Module A26 EPA20 Engine

The ECM’s job is to monitor, control, and optimize all engine operations by processing data from sensors and sending commands to actuators.
Its overall goals are:

1. Performance – Make the engine produce the right power under all driving conditions.

2. Fuel Efficiency – Use the least fuel possible for the required power.

3. Emissions Control – Keep exhaust gases within environmental limits.

4. Engine Protection – Prevent damage by monitoring temperature, air/fuel mixture, and other conditions.

Check Engine Light (CEL) Comes On

Often the first sign.
May flicker or stay on constantly.
Can show multiple unrelated trouble codes.

Engine Misfires or Runs Rough

Rough idling, stalling, or hesitation.
Irregular acceleration or surging.

Starting Problems

Engine may crank but not start.
Sometimes the car starts intermittently.

Poor Fuel Economy

ECM may mismanage fuel injection.
Car consumes more fuel than usual.

Transmission Shifting Issues (if ECM controls transmission)

Harsh or delayed shifting.
Transmission may get stuck in one gear.

Sudden Performance Problems

Loss of power while driving.
Engine may shut off unexpectedly.

Electrical Issues

Random sensor or actuator errors.
Inconsistent dashboard readings.