Codes finally fixed
Thread Starter
Pro
Joined: Nov 2002
Posts: 717
Likes: 11
From: Pleasanton CA
Codes finally fixed
I have been trying to find the cause of a few ongoing problems with my 01, for the last 2 mos I've been getting the dreaded service traction control, active handling and abs, the codes were;
PCM-P1571
PCM-P1689
TCS-C1277
BCM-B0432 (rear defog ckt ??)
IPC-U1040
SDM-U1040
I checked everything,I cleaned each ground and used a star washer on each,I replaced the battery,I even cut off the multi connectors and soldered them to a lug connector,I posted on several Vette forums and had a few hints but mostly nothing. Then I read a post by Bill Curlee on ignition switch repair and the light went on
What I had been reading in the service manual was low voltage could be the cause,I never would have thought about the switch if I had not read Bill's post. I ordered a new switch from Gene(GMPartsDirect) and installed it, and so far not one code,so I believe the burned contacts (I had 3 burned) are the cause of a lot of grief for some of us C5 owners.Repairing the switch is easy especially if you follow Bill's step by step directions. I bought a new one as the cost is reasonable($58.97+$8.50 shiping).I hope this helps someone who is struggling to find the causes of some of the TCS and active handling codes. Be sure to check out Bill Curlee's post on this topic on this forum. 
PCM-P1571
PCM-P1689
TCS-C1277
BCM-B0432 (rear defog ckt ??)
IPC-U1040
SDM-U1040
I checked everything,I cleaned each ground and used a star washer on each,I replaced the battery,I even cut off the multi connectors and soldered them to a lug connector,I posted on several Vette forums and had a few hints but mostly nothing. Then I read a post by Bill Curlee on ignition switch repair and the light went on
What I had been reading in the service manual was low voltage could be the cause,I never would have thought about the switch if I had not read Bill's post. I ordered a new switch from Gene(GMPartsDirect) and installed it, and so far not one code,so I believe the burned contacts (I had 3 burned) are the cause of a lot of grief for some of us C5 owners.Repairing the switch is easy especially if you follow Bill's step by step directions. I bought a new one as the cost is reasonable($58.97+$8.50 shiping).I hope this helps someone who is struggling to find the causes of some of the TCS and active handling codes. Be sure to check out Bill Curlee's post on this topic on this forum.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Thats an interesting combination of codes
I've had the dreaded C1287 so I think mine is probably the SWPS. I dont have any other codes to go with it and its erratic.
Glad you found the fix and I bet most wouldn't even think of the ign switch. Hopefully that will give others another idea to follow if they dont come up with a fix
I've had the dreaded C1287 so I think mine is probably the SWPS. I dont have any other codes to go with it and its erratic.
Glad you found the fix and I bet most wouldn't even think of the ign switch. Hopefully that will give others another idea to follow if they dont come up with a fix
Instructor
Joined: Aug 2006
Posts: 208
Likes: 0
From: Spring Hill FL
