Cruise Control Issue
Thread Starter
Intermediate
Joined: Oct 2016
Posts: 28
Likes: 0
From: Utica OH
Cruise Control Issue
Hi all,
I just bought a 2002 C5, and I have the following problem. Occasionally, the cruise control will disengage for no apparent reason with the Active Handling turned on. If I turn off the Active Handling, it doesn't do it. I read the forum and saw the info on grounds and disconnected the battery to clean all of the grounds before I did anything else, and it didn't fix the problem. (The grounds all appeared to be very clean) Next, I checked the codes, and I have the following:
28-TCS -
C 1214 H
C 1287 H
AO-LDCM
B 2252 H
B 2282 H
B 2284 H
U 1064 H
A1 RDCM
B 2283 H
B 2285 H
U 1064 H
I didn't check the codes before I disconnected the battery so I'm not sure if any of the codes were caused by disconnecting the battery or not. Should I clear the codes and start again, or is there something in the codes that is a "smoking gun"?
Thanks in advance. This forum is invaluable for us C5 newbies.
Regards,
Merle
I just bought a 2002 C5, and I have the following problem. Occasionally, the cruise control will disengage for no apparent reason with the Active Handling turned on. If I turn off the Active Handling, it doesn't do it. I read the forum and saw the info on grounds and disconnected the battery to clean all of the grounds before I did anything else, and it didn't fix the problem. (The grounds all appeared to be very clean) Next, I checked the codes, and I have the following:
28-TCS -
C 1214 H
C 1287 H
AO-LDCM
B 2252 H
B 2282 H
B 2284 H
U 1064 H
A1 RDCM
B 2283 H
B 2285 H
U 1064 H
I didn't check the codes before I disconnected the battery so I'm not sure if any of the codes were caused by disconnecting the battery or not. Should I clear the codes and start again, or is there something in the codes that is a "smoking gun"?
Thanks in advance. This forum is invaluable for us C5 newbies.
Regards,
Merle
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The very first thing that I would do is check the CLUTCH & BRAKE Peddle switch. If they are not in proper adjustment, any BUMP can cause them to tell the EBTCM that you applied the BRAKE and or pressed the clutch (if you have one) and that disengages the cruise.
When you experience the issue, WITHOUT turning off the ignition, read the DTCs using the DIC. If you have DIC messages, just press RESET until they clear and then read the DTCs
CLEAR all that previous info and start with a clear slate.
The C1214 DTC tells us that you need to have the EBTCM internal power relay replaced. Replace it or send the module to one of the ABS Fixer people.
If you really have a 1214 issue, it will sooner or later prevent the module from even working.
Bill
When you experience the issue, WITHOUT turning off the ignition, read the DTCs using the DIC. If you have DIC messages, just press RESET until they clear and then read the DTCs
CLEAR all that previous info and start with a clear slate.
The C1214 DTC tells us that you need to have the EBTCM internal power relay replaced. Replace it or send the module to one of the ABS Fixer people.
If you really have a 1214 issue, it will sooner or later prevent the module from even working.
Bill
Last edited by Bill Curlee; Mar 2, 2017 at 10:58 AM.
Thread Starter
Intermediate
Joined: Oct 2016
Posts: 28
Likes: 0
From: Utica OH
Cruise Control Issue
Thanks to both of you for the info. This forum, and guys like you both, are invaluable.
Check out the switches mentioned and clear the codes and then drive the car to see what codes return.. Those codes that return are the ones that need attention.
The LDCM and RDCM codes you posted are from a recent battery related event. Either the battery went low or perhaps was disconnected/reconnected and caused those codes.
The C1214 would be the first thing to work on. It may be responsible for the C1287 (Steering Wheel Position Sensor) or there may be a separate issue with the SWPS being/going bad. Unfortunately EBCM and SWPS issues are NOT uncommon on the C5.
Here is a link to a DIY thread about repairing the EBCM C1214 code if you are a DIY type person:
http://forums.corvetteforum.com/c5-t...r-fleabay.html
Check out the switches mentioned and clear the codes and then drive the car to see what codes return.. Those codes that return are the ones that need attention.
The LDCM and RDCM codes you posted are from a recent battery related event. Either the battery went low or perhaps was disconnected/reconnected and caused those codes.
The C1214 would be the first thing to work on. It may be responsible for the C1287 (Steering Wheel Position Sensor) or there may be a separate issue with the SWPS being/going bad. Unfortunately EBCM and SWPS issues are NOT uncommon on the C5.
Here is a link to a DIY thread about repairing the EBCM C1214 code if you are a DIY type person:
http://forums.corvetteforum.com/c5-t...r-fleabay.html
Burning Brakes
Joined: Jun 2008
Posts: 940
Likes: 81
From: Lake Villa IL
I also agree with the above. When you check the codes after clearing them I bet the C1287 will come back. That is the SWPS. The part # is 88965543. They still make them for the '01 and newer cars. I had the same thing happen to my '04.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
There are a few things that will dis engage your cruise control----A misfire whether REAL or FALSE will make the CC dis engage--So will a fouled brake light circuit on an auto car or the clutch circuit on a manual car---Also on an auto car a misfire will also cause the converter to "UNLOCK" which again will make the CC dis engage---
Finally on an auto car the converter will not lock until the trans temp goes above apprx 140* which may cause the CC to act weird
On a stock engine this is rare However on engines that have major mods--these mods will create false misfires--The biggest culprit for false misfires are
1. LT headers ( sometimes even shorty hdrs)
2. After market camshafts
3. A higher than stock TQ converter
4.On a manual trans --a lightened flywheel or aftermarket clutch
5 stiff stronger nosier valve train ( springs or rocker arms)
any mod that creates "new different engine noises different from the stock engine noise
GOOD news is that all these nosies can be "tuned out" with proper tuning
Finally on an auto car the converter will not lock until the trans temp goes above apprx 140* which may cause the CC to act weird
On a stock engine this is rare However on engines that have major mods--these mods will create false misfires--The biggest culprit for false misfires are
1. LT headers ( sometimes even shorty hdrs)
2. After market camshafts
3. A higher than stock TQ converter
4.On a manual trans --a lightened flywheel or aftermarket clutch
5 stiff stronger nosier valve train ( springs or rocker arms)
any mod that creates "new different engine noises different from the stock engine noise
GOOD news is that all these nosies can be "tuned out" with proper tuning
Thread Starter
Intermediate
Joined: Oct 2016
Posts: 28
Likes: 0
From: Utica OH
The very first thing that I would do is check the CLUTCH & BRAKE Peddle switch. If they are not in proper adjustment, any BUMP can cause them to tell the EBTCM that you applied the BRAKE and or pressed the clutch (if you have one) and that disengages the cruise.
When you experience the issue, WITHOUT turning off the ignition, read the DTCs using the DIC. If you have DIC messages, just press RESET until they clear and then read the DTCs
CLEAR all that previous info and start with a clear slate.
The C1214 DTC tells us that you need to have the EBTCM internal power relay replaced. Replace it or send the module to one of the ABS Fixer people.
If you really have a 1214 issue, it will sooner or later prevent the module from even working.
Bill
When you experience the issue, WITHOUT turning off the ignition, read the DTCs using the DIC. If you have DIC messages, just press RESET until they clear and then read the DTCs
CLEAR all that previous info and start with a clear slate.
The C1214 DTC tells us that you need to have the EBTCM internal power relay replaced. Replace it or send the module to one of the ABS Fixer people.
If you really have a 1214 issue, it will sooner or later prevent the module from even working.
Bill
Regards, Merle
Last edited by 68 Big Block; Mar 10, 2017 at 10:43 AM. Reason: Added Info
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
If a Traction Control event or ACTIVE HANDLING EVENT caused the cruise to turn off, The TC or AH event would have been ACTIVE for short period of time. When any EBTCM Handling feature goes active, you should have see that event message come on breifly in the DIC Message Center. Next time it shuts off the cruise, glance down at the DIC and see if there are any messages displayed.
If an EBTCM ERROR causes the issue, that EBTCM DTC will be storred in EBTCM Memory with in that ignition cycle.
If you read the DTCs (WITHOUT) turning off the ignition, (shortly after the cruise turns off) you should be able to pull up ANY DTC that the EBTCM is complaining about.
If there are no storred DTC,,,,,,,,
,,,,,,,,,,,,, I will have to dig a LOT deeper to try to figure it out. 
BC
If an EBTCM ERROR causes the issue, that EBTCM DTC will be storred in EBTCM Memory with in that ignition cycle.
If you read the DTCs (WITHOUT) turning off the ignition, (shortly after the cruise turns off) you should be able to pull up ANY DTC that the EBTCM is complaining about.
If there are no storred DTC,,,,,,,,
,,,,,,,,,,,,, I will have to dig a LOT deeper to try to figure it out. BC
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
My 01 MN6 was disengaging the cruise about every time I got it warmed up and in 6th.
I changed plugs and wires as part of regular maintenance, and come to think of it, it hasn't done it since
Another thing I did was warm it up in the garage for an extra few seconds while I put my seat belt on and adjusted the wheel. haven't done that in a while either.
Hasn't done it since. I bought the steering wheel position sensor, but it hasn't done it in a long time now, so not sure if I have to change it.
I am amazed at this car. I haven't done much to maintain it, and it just starts and goes.
80,000 miles and just little things.
I changed plugs and wires as part of regular maintenance, and come to think of it, it hasn't done it since
Another thing I did was warm it up in the garage for an extra few seconds while I put my seat belt on and adjusted the wheel. haven't done that in a while either.
Hasn't done it since. I bought the steering wheel position sensor, but it hasn't done it in a long time now, so not sure if I have to change it.
I am amazed at this car. I haven't done much to maintain it, and it just starts and goes.
80,000 miles and just little things.
Last edited by coupeguy2001; Mar 10, 2017 at 10:59 PM.
Heel & Toe
Joined: May 2014
Posts: 15
Likes: 10
From: Orland, CA
I had the same problem years ago, dealer replaced a sensor in the steering and it solved it. Unfortunately I cannot find the invoice with the exact sensor but the symptoms were exactly like yours. Good luck.
Thread Starter
Intermediate
Joined: Oct 2016
Posts: 28
Likes: 0
From: Utica OH
If a Traction Control event or ACTIVE HANDLING EVENT caused the cruise to turn off, The TC or AH event would have been ACTIVE for short period of time. When any EBTCM Handling feature goes active, you should have see that event message come on breifly in the DIC Message Center. Next time it shuts off the cruise, glance down at the DIC and see if there are any messages displayed.
If an EBTCM ERROR causes the issue, that EBTCM DTC will be storred in EBTCM Memory with in that ignition cycle.
If you read the DTCs (WITHOUT) turning off the ignition, (shortly after the cruise turns off) you should be able to pull up ANY DTC that the EBTCM is complaining about.
If there are no storred DTC,,,,,,,, ,,,,,,,,,,,,, I will have to dig a LOT deeper to try to figure it out.
BC
If an EBTCM ERROR causes the issue, that EBTCM DTC will be storred in EBTCM Memory with in that ignition cycle.
If you read the DTCs (WITHOUT) turning off the ignition, (shortly after the cruise turns off) you should be able to pull up ANY DTC that the EBTCM is complaining about.
If there are no storred DTC,,,,,,,,
,,,,,,,,,,,,, I will have to dig a LOT deeper to try to figure it out. BC
Secondly, is it likely that replacing the SWPS will cure the problem?