#627 of 629 SES light flashes when in reverse or hard braking by bmiller2000

May 09, 2009 (5:52 am)

#628 of 629 SES light flashes when in reverse or hard braking by bmiller2000

May 01, 2009 (7:20 am)

Replies to this message:

• 442dude (May 09, 2009 5:52 am)

#629 of 629 Re: SES light flashes when in reverse or hard braking [bmiller2000] by 442dude

May 09, 2009 (5:52 am)

Replying to: bmiller2000 (May 01, 2009 7:20 am)

Here's a suggestion:
 
Find a friend or shop with a Tech2 GM scanner. The computer will store a "history code" which will tell you any event that caused the SES light to go on and will also store a bunch of information that caused the SES light to go on - a "snapshot" of that moment in time if you will. You will then find out exactly what is going on without guessing. Chances are there's another code going along with it - its not uncommon to have 2 error codes get stored at the same time.
 
BTW - a flashing SES light is telling you that the motor is misfiring. The history code should tell you which cylinder is misfiring and the info might even point you to the problematic part under the hood.
 
A thought: Have you ever replaced the CPS (crankshaft position sensor)? There's a learn procedure when you replace the CPS that has to be performed so the motor doesn't give a false signal that its misfiring.
 
Good Luck