How to Replace the Electronic Spark Control Module

The electronic spark control module (ESC) is one of many components in your ignition system. Working alongside your distributor and ignition control module, the electronic spark control module varies ignition depending on many things like engine load. It signals the distributor to advance or retard timing. Symptoms of a bad electronic spark control module include the Check Engine Light being on and the engine not starting. Once you have diagnosed that the electronic spark control module is failing, replacement is easy.

Part 1 of 1: Replacing the ESC module

Materials Needed

esc module location

Step 1: Locate the ESC module. Typically located on the firewall, the ESC module may be located any number of places in the engine bay depending on application.

battery cable being removed

Step 2: Disconnect the battery. Whenever working on your vehicle’s electrical or electronic systems, it’s a good idea to disconnect the battery.

Always remove the negative battery cable and make sure it is not making contact with any metallic part of the engine or chassis.

Step 3: Remove the ESC module. Unplug the ESC electrical connector and be careful as the constant heat cycling from age and mileage causes the plastic connector to become brittle and break easily.

Select the appropriate driver to remove the ESC module mounting screws.

Step 4: Reinstall the ESC module. Install the new ESC module and carefully plug the connector back in.

Step 5: Reconnect the battery. Once the ESC module and connector are properly secured, reconnect the battery and start the vehicle to verify your repair.

  • Note: If your ESC set a fault code and illuminated your Check Engine Light, some vehicles will clear the code simply by the battery being disconnected. Other vehicles may require you to use a scan tool to clear the fault code. If you do not have one available, your local service facility or auto parts store may be able to do so for you.

This job is a relatively straightforward one, but if you don’t feel confident completing this repair yourself, have one of YourMechanic’s certified technicians come to your home or place of business and perform an electronic spark control replacement for you.

Next Step

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8 years of experience
461 reviews
8 years of experience
Oldsmobile Alero L4-2.2L - Electronic Spark Control - Detroit, Michigan
Was able to diagnose the problem, but could not complete the repair. We have to take to a muffler shop to get catalytic converter repaired. Would definitley use him again. Very nice man 
Saab 9-5 - Check Engine Light is on - Detroit, Michigan
Claud is extremely capable and knows his trade. He is very trustworthy and sincere.


21 years of experience
204 reviews
21 years of experience
Chevrolet Tahoe V8-5.7L - Car is not starting - Concord, California
It was a positive experience
Nissan Maxima - Engine or Transmission Mount Replacement - Pittsburg, California
Shaun was very professional on time and finished the job.


16 years of experience
310 reviews
16 years of experience
Honda CR-V L4-2.4L - Starter - Marietta, Georgia
He came, did his job with no problem, completed the task all while being professional. I will recommend him any day :-)
Nissan Murano - Car is not starting - Powder Springs, Georgia
Very knowledgeable, tested all possible issues to fix the problem. Unfortunately it may be deeper than original diagnosis.


17 years of experience
227 reviews
17 years of experience
Lincoln MKC L4-2.0L Turbo - Spark Plugs - Boca Raton, Florida
Adam is truly an awesome mechanic. He is thorough and knowledgeable while providing first-class service.

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