SES Question?

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Jul 9, 2006 | 08:58 PM

CG77VETTE

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Drifting

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From: Denville NJ

SES Question?

No codes stored so I threw in a new ignition module just because I had one on the shelf and still SES stays lit. Any suggestions? Thanks for any help. BTW, no recent mods.

Jul 9, 2006 | 09:39 PM

Hotred94

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From: Syracuse Utah

SES usually means battery problem, alternator problem, or aftermarket radio transplant.

Jul 9, 2006 | 09:44 PM

RRT vette

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From: Louisiana

When you ground A and B terminal does the SES light flash? Or does it stay on all the time when driving or trying to pull codes?

Jul 9, 2006 | 09:45 PM

CG77VETTE

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Drifting

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From: Denville NJ

Quote:

Originally Posted by Hotred94

SES usually means battery problem, alternator problem, or aftermarket radio transplant.

Thanks for your reply. The battery is fairly new and charged regularly with a battery tender, the alternator was replaced last year and the radio has been in for 4 years with no ill effects. I guess the alternator could have gone bad but wouldn't the volts light come on if that were the case? I seem to remember that's what happened last year.

Jul 9, 2006 | 09:56 PM

RRT vette

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From: Louisiana

If the light stays on all the time, you have open/grounded circuit to the ECM.

Jul 9, 2006 | 10:36 PM

CG77VETTE

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Drifting

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From: Denville NJ

Quote:

Originally Posted by RRT vette

If the light stays on all the time, you have open/grounded circuit to the ECM.

The SES light flashes when pulling codes but stays on when engine is running. I don't know if it's related, but right before the SES light came on, I had the surging rough idle problem I had a few weeks ago. I changed the wires, plugs cap & rotor at that time and seemed to solve the idle problem because I drove about 200 miles with no idle problem at all. Could this be an intermittant EGR problem? Thanks for your help and reply.