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WesTech Technical Information - GM Code Retrieval
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GM Code Retrieval

Entering Diagnostic Mode

Turn ignition switch on but do not start engine, "CHECK ENGINE " should glow. Locate test connector to ECM under instrument panel near steering column. Insert jumper across "TEST" and "GROUND" terminals.

"CHECK ENGINE" Light should flash Code 12. (Flash, Pause, Flash Flash.) Code 12 will be repeated two more times. If any trouble codes are stored they will be displayed in the same manner.

Trouble codes will be displayed from the lowest to the highest numbered codes. (Three times each) and will be repeated as long as test terminal is grounded.

To exit diagnostic mode, turn ignition switch off and remove jumper.

Reading Trouble Codes

The ECM stores component failure information for the CCC system under a related trouble code which can be recalled for diagnosis and repair.

When recalled, these codes will be displayed by flashes of the Check Engine Light. Trouble codes are read by counting the flashes of the CEL. For example; Flash, Pause, Flash, Flash longer pause identifies as 12.

Clearing Trouble Codes

Trouble codes are cleared by removing battery voltage from the ECM for at least 10 seconds. To do so, be sure ignition switch is in the OFF position and remove the positive battery cable, or disconnect the ECM positive pigtail from the battery, or remove the ECM fuse from fuse panel.


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