ABS and TC lights

[guruerror]

This message is primarily for HUMMTECH but PMs seem to be down, so I'm posting here. Feel free to reply.

Went wheeling through some deep (2-3 feet pretty consistently), icy water and got TC, ABS, and Parking Brake lights on and off the whole time. It's been a month and I've still got the lights on. Not always all three...but always ABS and TC.

I just pulled the positive off the battery, checked the rear wheel speed sensor cables, pulled the sensors out, cleaned everything and put it back together and took it for a drive. I still have the lights.

Thoughts?

Thanks in advance.

[jsbihn]

Did you scan for codes?

[guruerror]

Sorry...forgot. No codes at all.

[jsbihn]

I am definitely not HT, and I know that you probably know more about these "rigs" than I do, but do you think that possibly its either a computer issue (ie. you got the BCM or something wet), or the sensor (ie. they are wet or damp or something.... even though I know you cleaned them and such) or that maybe the dash is malfunctioning?

Plus the fact that it is an intermittant problem....
Do you have anything that is not performing correctly to correlate with the light?

Again... not an expert but based off standard GM OBD I would think that if you have a light you should have a code... sometimes you even have codes with no lights (Ie. no CEL on my vette, but I have a couple of codes pop up on every start up because the O2 sensors are not a fan of my headers)

[HUMTECH]

What did you scan for codes with? If its a code reader it wont pick up chassis codes. Need a pretty good scan tool to get codes from ebcm. I would start there but you could look at transfer case speed sensor wiring and connectors for damage, water intrusion in connector at speed sensors. I bet there is codes set in ebcm with those lights on.

[guruerror]

I used my SuperChips Cortex programmer to look for codes. I'll check the transfer case tomorrow and maybe swing by the old Hummer dealer to have them scan it.

Thanks...I'll report back.

[guruerror]

I checked the cable going into the transfer case. There's no visible damage...it was mud crusted, but I disconnected it, cleaned it, applied some dielectric grease and reassembled. Took it for a drive...still got the lights.

I was feeling lazy so I took it to Advanced Auto to have them pull codes instead of the dealer. Here's what came up on their scan tool:

U1305
U1000
U1040
U1016
P1626
U1301

Most of these seem to deal with serial communication errors. I'm starting to think that I've damaged some part of the on-board computer system. I also noticed that the 4WD is out. I can no longer switch to 4HI or 4LO.

LOL...looks like I'll be off to the dealer before my next adventure.