ECU code clear question, YIKES

[SoCal LS-L]

Did code read, getting codes for 32, 33, 37, and 56. I do the code clear procedure, which turns off the MIL, but when I try to verify the codes are cleared again, they still read in the self-test instead of the MIL blinking steadily (cleared). Can cleared codes still be in the ECU but the MIL be off ?? I used to only get the code 56 until I cleared them the first time, then 32, 33, and 37 came up on the test drive immediately after. Im a pretty good mechanic but the spontaneous addition of the 30's codes has stumped me.

[redlightningsvx]

Disconnect you battery over night and try it again in the morning. It should clear any stored codes.

[SoCal LS-L]

Interestingly, after I did the code clear, the MIL has remained off for about 30 minutes of driving. 4 codes just a fluke? Im sure the EGR one will come back but I can live without the others...... The subie ECU is a tricky one

[Suby Fan]

you have cleared the codes and they have come back that to me doesn't sound like a fluke...It sounds like you possibly have pending codes... have you tried diagnosing any of these codes? one is a speed sensor code and you have two O2 sensor codes.... any driveabilitly concerns? do you know how to test a speed sensor or 02 sensors?

[1986nate]

Originally Posted by Suby Fan

you have cleared the codes and they have come back that to me doesn't sound like a fluke...It sounds like you possibly have pending codes... have you tried diagnosing any of these codes? one is a speed sensor code and you have two O2 sensor codes.... any driveabilitly concerns? do you know how to test a speed sensor or 02 sensors?

He said the MIL stayed off now after driving

[Suby Fan]

Originally Posted by 1986nate

He said the MIL stayed off now after driving

he said for 30 min... i assumed he meant it comes on after 31 mins of driving

[SoCal LS-L]

Ok, on the 4th trip out in my car, the MIL came back on before the car even warmed up. The same 4 codes reappeared simultaneously (32,33,37,56). That seems unusual to me..... do these sensors share a circuit? The O2's on both sides and the Vehicle speed sensor?? I know the 56 is the EGR, ive had that since I bought it..... but the other 3 codes popping up simultaneously to begin with.... then again today after the code clear a few days ago makes me wonder..... it idles and drives fine.... and also shifts fine. One more thing of note.... the fuel gauge fluctuates after about it gets down to about 2/3 tank.... going all the way to empty and then popping back up to 2/3. Could they be related electrically somehow?? Im stumped!

[kwren]

Fuel gauge is not related.

"do these sensors share a circuit?" no.

The 02 sensors will sometimes give a code because an unrelated condition they are sensing is incorrect.

"The subie ECU is a tricky one" ??

Big understatement!

Sorry,
Keith