Richard995

Hello all,

This is my first post. I have a 2002 VET. My wife came home last night with a lot of problems and errors coming up on the message center. When I got home I cleared all the codes and waited till this morning to check it out. I verified there was no error codes. I started the car 5 times. On the 5th start I got the errors. I stopped the engine and retrived the following codes:

10-PCM P1626 H
28-TCS U1301 H
40-BCM U1255 H
U1016 H
U1096 H
28-TCS U1301 H
58-SDM U1301 H
U1040 H
60-IPC U1255 H
U1016 H
U1064 H
U1040 H
U1176 H
U1088 H
80-Radio U1064 H
U1016 H
99-HVAC U1064 H
U1096 H
U1160 H
U1255 H
AO-LDCM B2264 H
U1064 H
A1-RDCM No Comm.
A6-SCM U1300 H
U1255 H
BO-RFA U1255 H
U1016 H

I know the U1016 is Loss of Communications with PCM. U1040 is Loss of Communications with TCS. U1064 is Loss of Comm with BCM. U1096 is Loss of Comm with IPC. I don't think I lost communications with everything at once.

Does anyone have an idea where to start. I am going to go clean all the ground connection and the battery terminals. BTW, the battery is 5 years old next month. The engine cranks and starts great. I have not had any problems within the last 3 years.

lucky131969

Based on the RDCM "no comm", I would start by inspecting the wiring to the right door....in the accordion tube.

KOZ

Check the battery, looks like it may have leaked onto the PCM and harness.

lucky131969

Are you a psychic, or do you have a crystal ball?

KOZ

'The Force is strong with this one.'

lucky131969

Because there is a solid "no comm" for the right door, and an obvious disruption of class 2 communication, as corroborated by the numerous U1255 codes. While the battery could be an issue, I see an absence of B228X codes, which are consistent with a low/disconnected battery condition.

The OP asked for a suggestion as to "where to start"....that's my suggestion.....it doesn't mean I'm right.

Richard995

Thanks for getting back with me so soon.

OK, Just got done with cleaning the ground wires and battery terminals. I removed the battery to see if it had leaked. No leaks. Also looked at the wiring in the battery area. No noticable problems. I also checked the wiring to the right door. No problems with the wiring, that I can see. I pulled the boot from one side, then the other.

After doing this I checked again. And again, after several starts in a row I got the same codes.
The right door is strange. It didn't work when I reconnected the batter but the engine started with no codes or messages on the message center. After I got the codes and messages on the message center the right door started working again. (I don't understand that at all). I shut the engine off and restarted. It started without the errors or messages. It appears to only give me the messages about every 5th or 6th start.

Should I clear the error codes; start it and if I don't get the messages check for error codes and see if something is just coming up without giving me a message on the message center?

As for the battery. I plan on getting a new battery tomorrow. It does not appear to be bad. I checked the voltage. 12.6 with the engine off. 14.2 with engine running and charging.

lucky131969

Try this. In the passenger footwelll next to the BCM, there are two connectors call "star" connectors. They are basically shorting plugs, that connect all the class 2 systems together. You want to remove the shorting plug from the star connector 2( purple, brown, tan, and brown/white stripe wires). This will isolate the door wiring entirely from the class 2 serial communication. See if this resolves the balance of the codes. Just be aware, that the left & right door functions will not work during this test.

Richard995

Lucky131969, Thanks, I will try that in the morning. I have put it to bed and it is dinner time. (I have to give the wife some attention tonight).

lucky131969

No problem. Enjoy your evening.

Richard995

I did as you suggested. I disconnected the Star 2 Connected. I started the car 20 times. No problem. The battery apparently handled it without a problem. Now is it in the door? Maybe a switch going bad? But, when the right door doesn't work, The bottons on the right side door don't work and I can not control the right side from the left door. Or is it in the wiring?

lucky131969

Yep. You may have a wiring issue, or bad door control module. In the link below, Bill is showing the wiring/connectors for the left door. The right is the same. You can inspect the wiring in the tube, connections, etc. If you want to isolate further, you can unplug the connectors to the right door, and install the shorting plug back in start connector 2. If the codes stay away, you know it's in the right door for sure.


http://forums.corvetteforum.com/1578756354-post4.html

Bill Curlee

Thats where I would start..

Richard995

Thank a lot guys. I don't have a lot of experience with all this electronics. I am old school. My daily driver is a 93 Jeep Wrangler. No electric windows and door locks. I can start the jeep without engaging the clutch. Also there is a lot more room under the hood with that 6 cylinder under the hood. I will let you know what I find.

BigGun

Yea.....but it won't do zero to sixty in 5 seconds.

Atok

My guess is a bad battery. Seen this before.

Richard995

I will try disconnecting the right side door first and see if that is my problem. The battery is getting old and I may just change it on principle. (don't want to be out somewhere with a dead battery).

Richard995

OK, I went out and disconnected the right door. I went around and tried to start the car. The battery was down to 10.4 volts. I guess the stress I put on the battery over the last 2 days killed the battery. I went and got a new battery. I charged the battery before installing. I reconnected the right door. I Don't want to change 2 things when I am trying to track down a problem. I started the car and did not get an error. I started 8 times with no errors.

For all of you that said it was the battery you may be right. I will drive it for the next few days and see if I get any errors.

Thanks for all of your help. I will post again in a few days to update you all.

If any of you have a question about an old Jeep give me a shout. LOL

lucky131969

Good luck with that.

Richard995

It has been 2 days of daily driving. No problems so far. Maybe it was just the battery. If so it was an easy fix. The only error I get it the one I have had for several months now. P1416. If I can figure out how to get to that darn valve I will replace it. Is there a thread on here showing how to get to this darn thing? I have tried the spraying WD40 and carb cleaner but still get the error.