Service Engine Soon!

[fordy6]

Can anyone tell me why my Service Engine Soon light comes on when I use my A/C? If I do not use the A/C for a while the light will turn off.........In the manual it does mention it will go on if you recently went through a deep puddle. Could there be some kind of condensation going on near a sensor?
Thanks, Mike

[Robyn]

what year is the rig??

IIRC it has a sensor that will sense low pressure or high pressure and then the ECM will howl if it does not like something.

Get the codes pulled and see whats up.

Good luck

Robyn

[fordy6]

1997 Gmc 1500 6.5

[chickenhunterbob]

As per Robyn's reply...

The first logical thing it to read (or have it/them read) the code(s).

The SES light is trying to tell you something, just gotta find out what