CEL on, no codes stored?

[TwIzTeD_3kGt]

This just started happening out of the blue. Hadn't flashed anything for a couple days, then yesterday afternoon I start it and the CEL is on. I used a scan tool to check the code, no DTC's found. I cleared it, it was gone on the next start up. The next start up, it was back again, no DTC's found again. I drove it, drove it hard, CEL went out. Next startup it's back on.

Any ideas?

[Greg E]

Evoscan 2.9?

[TwIzTeD_3kGt]

Evoscan 2.9?

Yes. I checked the codes with a hand-held scanner though, not Evoscan if that's what you mean. I know it doesn't read codes correctly.

[Greg E]

The scan tools don't know how to read all the CEL codes. I used to remember what the codes were that your average scan tool couldn't read...

Anyway, what is your periphery 2 setup?

[Autochef]

Same problem here, I also use 2.9 and use a scanner, but it pops back on

[TwIzTeD_3kGt]

Used my Solus Pro, same thing.

P2 is bits 12-15 off, the rest enabled.

Nevermind its back on.

[TwIzTeD_3kGt]

I disabled knock on CEL and it's stayed off so far. Why now when I had no problems with it before?

[Greg E]

It's a coincidence.

[TwIzTeD_3kGt]

It's a coincidence.

Indeed it is, its on right now. What to do? If my Solus Pro can't read the code stored, what will?

[Jimvr4]

Codes can be read manually. Count number of slow flashes and number of fast flashes. Slow count = tens digit and fast count = ones digit.