My 01 did that also.
Turns out it was "carbon buildup". (02 sensor acting up) The dealer told me I drive to much like an old lady.
The fix was him flooring it in the parking lot to "release the carbon". I nearly tackled him.
He told me to either start running high test fuel, fuel additive, or start driving it like it's meant to be driven.
I started driving a little harder, and it never happened again.
Every time one of mine has done that, the fuel pump was bad.
I would think fuel filter or pump, but we know chevy fuel pumps never go bad.
Originally Posted by jpsmith1cm
Aire Serv of SW Connecticut- Gas heat, dual fuel and central a/c systems installed and serviced
Badass van in your avatar, freeze.
Flashing is bad. Too many possibilities. That's why the codes are stored. Go to Autozone.
Flashing is not "bad," per se.
Originally Posted by freerider
It means that the engine control module (ECM, PCM, etc) is operating in its minimum operating mode. We used to call it "limp in" or "limp home" mode.
In this case, the vehicle is being prevented by some subsystem or systems from operating properly. A scan of the history codes will tell you the specific area that is setting the code, but be aware of this: the codes describe the AFFECTED systems.They are not always the CAUSAL problem. That's why every code has a diagnostic tree that should be followed.
Start with a review of maintenance, get the scan, and pay for a few pages of an ALLDATA printout from a service facility that will sell it to you. Do the pinpoint testing and work from there.
What is the model, year and engine for this truck?
[Avatar photo from a Florida training accident. Everyone walked away.]
2 Tim 3:16-17
RSES CMS, HVAC Electrical Specialist
AOP Forum Rules:
By bad I mean not something you want to put up with. I have seen service vans that intermittenly had check engine light(steady) and ran fine, passing emissions. Chevy Vortecs leak sometimes in the injection spider, causing a bank rich code. However, if the light was off, they would pass. Never saw one pass when the light had flashed, even if it was off.