Last post on May 09, 2009 at 4:52 AM
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Chevrolet Astro, Chevrolet Venture, Van
#628 of 629 SES light flashes when in reverse or hard braking
May 01, 2009 (6:20 am)
Any Ideas what would make this happen? I finally got the trouble code P0650 which says indicator light illuminated. No crap!!! Really the ses light is on? Sorry, anyway it flashes then goes off during hard braking or when I shift into reverse, then goes of. It will stay on if I brake in reverse with foot on gas ( thats how I finally got the code) any ideas would be appreciated.
#629 of 629 Re: SES light flashes when in reverse or hard braking [bmiller2000]
May 09, 2009 (4:52 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.