There are many reasons your vehicle’s Check Engine Light (CEL) comes on. The Check Engine Light or Malfunction Indicator Lamp (MIL), is a signal from the vehicle’s Engine Control Module (ECM) that something is wrong. It could be anything from a bad catalytic converter to a loose gas cap. At minimum, you will need to diagnose the problem and locate the issue.

What is the Check Engine Light (CEL)?

Prior to 1996, carmakers had their own engine diagnostic systems, primarily to ensure their cars were compliant with Environmental Protection Agency pollution-control requirements. Starting with model-year 1996, automakers standardized their systems under a protocol called OBD-II, which stipulated a standardized list of diagnostic trouble codes (DTC) and mandated that all cars provide a universal connector to access this information.

When the vehicles electronic-control system finds a problem it cannot adjust, the computer turns on a yellow or amber warning indicator and stores a trouble code in its on-board computer diagnostic system memory. These Diagnostic Trouble Codes (DTC) can be read with a scan tool or diagnostic computer to help identify the likely source of the problem, such as a malfunctioning sensor or an engine misfire. If the Check Engine Light is steady, the problem is typically not an emergency, but should be addressed as soon as possible. A blinking Check Engine Light usually indicates a more severe issue such as an engine misfire.


Don’t Ignore That Light
So if the Check Engine Light comes on, what do you do? The most obvious answer, of course, is to get the vehicle scanned. Then call the professionals at
ModuleExperts for help with any Diagnostic Trouble Codes (DTC) related to Control Module issues. Our knowledgeable and experienced Parts Associates will be happy to provide information on the best and quickest solution to get you back on the road faster.


ModuleExperts brings more than 100 years of combined experience in module diagnostics, repairs and remanufactured replacements for all types of control modules. Our A+ BBB rating proves our commitment to first-class customer service and satisfaction. Contact us today to learn more about how we can help service your control module needs.