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Code U1000 causing active handling and ride control to code up

Tiny
LOUIS W NAGY
  • MEMBER
  • 2002 CHEVROLET CORVETTE
  • 5.7L
  • V8
  • 2WD
  • MANUAL
  • 90,000 MILES
This has been an on going problem for month; the ABS and suspension control modules and under hood fuse panel have been replaced. The last thing that was done was additional ground wire was connected at ABS plug connector and all wire connectors at plug were adjusted and cleaned for proper connection. This lasted for 3 weeks. Then the same codes came back: c1232, c1234, c1241, c1242, c1287, c1295, u1000, (anti lock)
C0579, c05854, c0589, c0594, c0691, c0710, cb2795, (suspension control), b2723 transmission, pref. Switch circuit high, u1040, lost communication with brake /traction control system. As you can see this is a major open circuit but it is only drops out intermittently. Codes will not. Clear at all and the traction and ride control and active handling are coding but the 80 mph limit is not on.
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Saturday, November 9th, 2019 AT 8:33 PM

15 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like the real time damping relay #41 in the under hood fuse panel is not working right. To be sure here is a guide to help test it and the electronic suspension wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Tuesday, November 12th, 2019 AT 11:13 AM
Tiny
LOUIS W NAGY
  • MEMBER
  • 55 POSTS
Thanks for information. Relay was good, codes are constant. I will ring out wires to relay, and check power wires to ABS module. Not sure were else to go from there. I will get back to you. Thanks
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Wednesday, November 13th, 2019 AT 9:43 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Let's check power and grounds then we can go from there. here is a guide to help:

https://www.2carpros.com/articles/how-to-check-wiring

Please run down this guide and report back.

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Wednesday, November 13th, 2019 AT 9:55 AM
Tiny
LOUIS W NAGY
  • MEMBER
  • 55 POSTS
I also have HVAC problem. A/C not cooling as good on driver side and both passenger and driver side. Actuators have been replaced, the dash is off and they function as they should. I can see it work. Where is the door for the driver side temperature and what diaphragm works it? Pictures would be big help. Factory book no help without scanner. I have A/C module on order but if that don’t fix it I’m lost. Diagram would help. Please reply.
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Wednesday, November 13th, 2019 AT 9:57 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
This is a new problem which you will need to make a new post for we will stay on the u1000 problem on this thread. Please check the power and grounds for the suspension controller. This would be a good problem for a CAN scan which is the future of car repair check out this video.

https://youtu.be/InIlnsjOVFA

Please run down this guide and report back.
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Thursday, November 14th, 2019 AT 9:52 AM
Tiny
LOUIS W NAGY
  • MEMBER
  • 55 POSTS
Okay.
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Friday, November 15th, 2019 AT 3:56 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Let me know when you do the CAN.
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Saturday, November 16th, 2019 AT 10:41 AM
Tiny
LOUIS W NAGY
  • MEMBER
  • 55 POSTS
Well have proper grounds and power to both suspension and ABS modules, ran attitudinal grounds on both and double checked reference voltage also. At this point I’m going to check rtd circuit for any problems.
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Saturday, November 16th, 2019 AT 1:08 PM
Tiny
LOUIS W NAGY
  • MEMBER
  • 55 POSTS
My manual is for tech2 scanner and all I have is BlueDriver. If you have anything to give me parameters for both module it would be helpful when ringing out wires. So I would have something to bounce the numbers off of. At this point I’m running out of options and this u1000 code is a hard to trace.
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Saturday, November 16th, 2019 AT 1:15 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Yes it is because the module all talk to each other and we need to find the one that is not talking. CAN scan is our best bet.
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Sunday, November 17th, 2019 AT 10:41 AM
Tiny
LOUIS W NAGY
  • MEMBER
  • 55 POSTS
Yes if I had access to that tool it would be great.
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Wednesday, November 20th, 2019 AT 5:00 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Here is a CAN scanner for $34.00:

https://www.amazon.com/gp/product/B007XE8C74/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=2carprcom-20&creative=9325&linkCode=as2&creativeASIN=B007XE8C74&linkId=9937e19f0e16a404ec2747fafb91c2eb

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Wednesday, November 20th, 2019 AT 10:15 AM
Tiny
LOUIS W NAGY
  • MEMBER
  • 55 POSTS
Coded up b0466 which is temperature actuator. So now I just have to figure out how to get to it with the dash off it should not be to bad. Got a clue where it’s at? Need to do both sides. Thanks
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Thursday, November 21st, 2019 AT 4:02 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
You will need to start a new question for the HVAC issue we can give diagrams but this post is for "Code U1000 causing active handling and ride control to code up" did the CAN scan give you anything on that?
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Thursday, November 21st, 2019 AT 12:48 PM

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