Tman2

Pulled existing codes that show as current. P1571 under 10- PCM and U1040 under 60- ipc. There are no other codes coming up. Please help!

Tela83

What were you doing when the lights came on? ie: on start-up, braking, after hitting a bump etc etc....

Tman2

Lights have been on for quite awhile now. At first start up they may come on then go off then come back on again. While driving they do blink on and off once in awhile. They may blink sometimes while hitting a bump.

Tela83

Does your cruise control function properly?

Tman2

Yes it does.

Tman2

Here are all the history codes that are coming up all under AO-LDCM.B2204, B2282, B2284 and U1064! Please help!

Bill Dearborn

The B codes indicate you have a voltage supply problem. P1571 indicates the PCM isn't receiving a Desired Torque signal from the EBTCM. How that works is the PCM sends a voltage level to the EBTCM and when the rear wheels ares starting to slip the PCM toggles the signal to ground which tells the PCM to reduce torque. The U code might not mean anything. They are sort of common and don't usually mean much.

The B codes indicate there is an issue with the B+ supply to the left side door modules. Typically if there was a battery or other common voltage issue you would see codes for both doors. The P1571 code can also be caused by a voltage supply problem to the PCM or EBTCM.

Typically you only get one problem at a time. You seem to have 3 at one time. Very unusual unless there is a common issue causing all 3. Although the right side door isn't showing a voltage issue I think you may have a voltage level problem. I think you should check your battery voltage level with a DVM in the underhood electrical center, also check the battery ground at the frame. Check battery cable connections to see if they are corroded. If there is an issue with the voltage level/ground that just might clear up your issue.

Bill

Tman2

Thx so much Bill, I will check thoseoptions and get back to you!

Tman2

Ok guys, checked both terminals on battery and they were clean and tight, chassis ground was clean and tight, also had the battery checked out on a dvm and it read 12.47. Going to go check two other grounds behind each headlight. Anything else I can check? And by the way how do you post pictures of your car on the forum?
Thx again all!

Mike94ZLT1

I love you guys.

laurent_zo6

To insert pics, start a new thread then just click the icon "insert image" above then upload the pics from your computer. The icon is yellow and shows grey mountains and grey square in top right corner.

ledesordre

Did you ever resolve this? Have same issue and codes. I suspect it is the EBCM module.

Tman2

I've been told it depends on what codes are showing up on your dash. I'm still currently working on mine. Read the prior posts and see if there is any similarities

Tman2

Have you checked all of the grounds on your car?

ledesordre

https://www.corvetteforum.com/forums...571-u1000.html

yes checked grounds, look good so far.

Tman2

Well, your farther along than I am! Lol did you check both under the car as well too?

Tman2

Can you please tell me in detail where the ground is under the battery? Do I need to remove the battery to get to it? Thx!

Tman2

Finally got all chassis ground wires checked and cleaned, lights are still coming on and blinking. What should I do next? Appreciate any kind of help! Thx

ledesordre

Nice- any suspect grounds? any difference after checking grounds?

Tman2

grounds were all in pretty good shape and really no difference at all with the lights.