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Dead ECU? Home / Dead ECU?

There are many reasons why you could have an faulty ECU. We can save you the time and money by testing your ECU DME before spending on costly diagnostic labor and sensors. Below is a helpful guide to determine if you have a faulty ECU. Fill out the Repair and Return Form and send us your unit today.

How to Diagnose your ECU
Part 1 Part 2

Here are the most common symptoms of a bad ECU:

  1. Check Engine Light stays on after resetting
  2. Car was jump started on reverse polarity
  3. Engine turning off for no reason
  4. Water Damage or Fire Damage on the ECU
  5. Apparent loss of spark
  6. Apparent loss of injection pulse or fuel pump
  7. If your alternator overcharged the battery
  8. Intermittent starting problems
  9. Overheating ECU
  10. ECU has Broken Pins
  11. Loss of communication between the ECU and the Scanner
  12. A control module memory checksum error

These are some examples of the damages that we see on most ECUs:

Water damaged ECU  Fire or Short Circuit damaged ECU  Broken Pins on the ECU  Broken tracks on the ECU  Cold Solder Joints on the ECU  Corrosion on the surface of the ECU  

Many other symptoms may occur that can drastically lead to an ECU failure such as:

  • Erratic idle
  • Stalling
  • Poor running condition
  • Excessive fuel usage

We recommend testing or replacing the following:

  • Ignition coils or ignition module
  • DME Relay or the Main Relay - Tutorial*
  • Faulty spark plugs
  • Fuel injectors
  • Idle control valves
  • TDC and RPM reference sensors - Video*
  • Air flow or mass flow meter
  • Throttle position sensor
  • Power supply
  • Grounds

If you believe you have a faulty ECU, we can save you the time and money by testing your ECU DME for $75 before spending on costly diagnostic labor and sensors.
ECU Repair Form
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Fill out the Repair & Return Form and send us your unit today!

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