How do I get my vehicle out of diagnostic mode if I've already disconnected the ground cable once

Asked by May 03, 2017 at 05:04 PM about the 1989 Chevrolet S-10 EL Standard Cab 4WD SB

Question type: Maintenance & Repair

I have a 1989 Chevrolet S10 2.5 EL standard cab
manual 5 speed 4x2

2 Answers


Try pulling the ECM fuse for just over 1 minute. This should reset it back to factory settings. It should be a blue 15A fuse.

1 of 1 people found this helpful.

If you have already pulled a battery cable then the ECM has been reset, just make sure you have removed the jumper for reading the flash out codes before attempting to drive it, there will be a relearn that the ECM will have to go through be just drive as you normally would and it will learn.

1 of 1 people found this helpful.

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