Here are the most common symptoms of a bad ECU:
Check Engine Light stays on after resetting
Car was jump started on reverse polarity
Engine turning off for no reason
Water Damage or Fire Damage on the ECU
Apparent loss of spark
Apparent loss of injection pulse or fuel pump
Intermittent starting problems
Overheating ECU
ECU has Broken Pins
Loss of communication between the ECU and the Scanner
A control module memory checksum error
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