CEL came on yesterday, 2006 ODB trouble codes

[strutaeng]

Oh, dang!

After clearing the codes I drove 15 miles with some freeway. I often select 3rd gear manually while driving on City streets.
Here are the codes I get. The O2 sensor codes did not reappear. The CEL did not come back on.

P Codes – 2006 Tahoe after 15 miles
P0442 Evap. Small leak
P0451 Fuel Tank Pressure Sensor Performance
P0454 Fuel Tank FTP sensor intermittent
P0464 Fuel Level Sensor (1) intermittent
P0567 Cruise Control Resume switch circuit
P0568 Cruise Control Set Switch Circuit
P0742 Torque Converter Clutch TCC system stuck on
P0751 1-2 Shift solenoid valve performance (no first/forth gear)
P0756 2-3 Shift solenoid valve performance (no first/second gear)
P0757 2-3 Shift solenoid valve performance (no third/forth gear)
P0894 Transmission component slipping
P1574 Stoplamp switch circuit

They don't call it "the money light" for nothing!

Thinking these are groups of issues: EVAP, fuel sender, and transmission. The stop lamp is probably related to transmission. Maybe as simple as brake light switch on the pedal?

Edit: I see your comment about the transmission...

 

[Doubeleive]

ouch, that's not going to be cheap
the largest chunk is going to be the transmission the rest is chump change
figure about $5k or so, slightly less if you can do some work yourself.
actually less if you are lucky and it's a 2wd you can grab a used transmission from a yard for around $1600 or so

 

[2006Tahoe2WD]

After some Googling/etc. a potential easy fix for the trans codes - there is a large electrical connector on the transmission. This might have worked its way out a bit and/or is being contaminated with trans fluid coming past the sealing O ring there.

 

[Fless]

The evap and fuel tank pressure codes are likely "pending" -- since the CEL isn't on yet -- and once they become active (after it fails the next time) it'll light up the money light. Expect it to happen after a full cold start.

 

[2006Tahoe2WD]

okay, good to know.

 

[Mudsport96]

If the rig is driving alright try to manually select gears 1-2-3-4 and see if you get shifts. There are too many transmission codes for it to not be shifting funny and you not notice it. So the plug on the trans is suspicious.

The CEL is most likely the evap codes as non-emission codes don't immediately trip the light.

 

[2006Tahoe2WD]

If the rig is driving alright try to manually select gears 1-2-3-4 and see if you get shifts. There are too many transmission codes for it to not be shifting funny and you not notice it. So the plug on the trans is suspicious.

The CEL is most likely the evap codes as non-emission codes don't immediately trip the light.

Thanks. Last night drove in manual gears 1,2,3. I'll double check and try all 4 gears today. The rig seems to be driving as well as it ever did. Shifting seems fine.

 

[2006Tahoe2WD]

Update. Went to my know good repair place. They sent me to the known good transmission place somewhat near me (San Jose). The guy there looked at the codes and said he is about 99% sure it is caused by a bad ignition module. He said there is a bulletin out on it.
I'm going to have one put in and see what happens.

 

[strutaeng]

After some Googling/etc. a potential easy fix for the trans codes - there is a large electrical connector on the transmission. This might have worked its way out a bit and/or is being contaminated with trans fluid coming past the sealing O ring there.

Yeah, definitely! Climb under there and do a quick visual. Remove the case plug and inspect for ATF fluid in there.

If suspect, drain the ATF, replace the filter, wiring harness and put new fluid. Opportunity to inspect the pan for any debris.

Update. Went to my know good repair place. They sent me to the known good transmission place somewhat near me (San Jose). The guy there looked at the codes and said he is about 99% sure it is caused by a bad ignition module. He said there is a bulletin out on it.
I'm going to have one put in and see what happens.

"Ignition module"? Huh? There's something called "ignition control module (ICM) on the previous generation of engine family, but the V8 LS engines don't have this.

I guess I was also going to say check your fuses to make something isn't blown, but let's hope whatever they change IS your issue.

 

[2006Tahoe2WD]

Yeah, definitely! Climb under there and do a quick visual. Remove the case plug and inspect for ATF fluid in there.

If suspect, drain the ATF, replace the filter, wiring harness and put new fluid. Opportunity to inspect the pan for any debris.

"Ignition module"? Huh? There's something called "ignition control module (ICM) on the previous generation of engine family, but the V8 LS engines don't have this.

I guess I was also going to say check your fuses to make something isn't blown, but let's hope whatever they change IS your issue.

Interesting..... I don't find any ignition module type parts in Rock Auto.