Hi, all! I am a relatively recent owner of a 2002 Corvette and the DIC is displaying the following messages:

Service ABC
Service Traction Control
Service Active Handling
Service TPMS

As per many great posts on the subject, I followed the procedure to get the codes. They are as follows:

P1571 h PCM Torque signal is out of the valid range (See C1277) PCM TCS
C1214 h c TCS Solenoid Valve Relay Contact or Coil Circuit Open EBCM Instrument Panel
C1226 h TCS RF Excessive Wheel Speed Variation EBCM Antilock Brake Sys
C1276 h TCS Delivered Torque Signal CKT Malfunction EBCM Antilock Brake Sys
C1277 h TCS Requested Torque Signal CKT Malfunction EBCM Antilock Brake Sys
C1294 h TCS Brake Lamp Switch Circuit Always Active EBCM ABS, TCS, Lighting Sys
U1040 h SDM Loss of Communications with TCS
b0361 h HVAC Left Actuator Feedback Short to GND HVAC HVAC Systems Automatic
B2282 h SO-LDCM 12V Power Feed #1 Fault LDCM Doors
B2284 h SO-LDCM 12V Power Feed #2 Fault LDCM Doors
B2262 h SO-LDCM Mirror Horizontal Position Sensor Fault LDCM Doors
B2264 h SO-LDCM Mirror Vertical Position Sensor Fault LDCM Doors
B2276 h SO-LDCM Door Lock Motor/Mirror Heater Fault LDCM Doors
U1064 h SO-LDCM Normal software function, history status upon ignition cycling All Modules Datalink Communications
B2283 h A1-RDCM 12V Power Feed #2 Fault LDCM Doors
B2285 h A1-RDCM 12V Power Feed #2 Fault RDCM Doors
B2263 h A1-RDCM Mirror Horizontal Position Sensor Fault RDCM Doors
B2265 h A1-RDCM Mirror Vertical Position Sensor Fault RDCM Doors
B2277 h A1-RDCM Door Lock Motor/Mirror Heater Fault RDCM Doors
U1064 h A1-RDCM Normal software function, history status upon ignition cycling All Modules Datalink Communications
C2105 h B0-RFA Right Front TPM Sensor Malfunction RFA/TPM Tire Pressure Monitoring
C2115 h c B0-RFA Left Rear TPM Sensor Malfunction

I am no mechanic and don't claim to know a lot about cars. I am a technical mind, however, and would like to tackle as much of this as possible. I heard that the first step is to check all the electrical grounds for the ABS. Ultimately, I'd just like to know in more detail what these codes mean and what I can do to clear/fix any.

I bought this car for my son and I to work on. So, it's a great bonding venture for us. Many moons again, over 30, I help restore a '68 Corvette and drove it. I always wanted another and I hoped I could share that great experience.

Anyway, if any of you experts can help, I'd greatly appreciate it. The car drives and sounds fine. I realize that the ABS, AH, and TC are all disabled. But, we don't plan on driving the Vette much in the rain. Nonetheless, I hate having nagging messages appear every time the car in on.

Thanks in advance for any help.

 

Your service ABS / Active Handling / Traction Control issues are probably resultant of the EBCM having issues. This is a very common problem with C5 Corvettes. As you have a 2002 car you're in better shape than half the C5 owners. 2001-2004 cars are readily serviced in the neighborhood of $150. Pre-2001 cars don't have it as good and require either completely changing the car over to post -2000 setup (which has been recently shown it can be done) or pony up $500-$2,000 for a USED part.

The issues with the door and window codes are possibly resultant of the multi prong connector. This part commonly has issues where the metal wire prongs stretch or become damaged. The good thing is these are relatively easy to check and service if need be (they typically do not require you to actually buy anything).

Throwing a TPMS code means you must own a non-Z06 car since Z06s have the TPMS programmed out. The issues with the TPMS probably mean that a TPMS sensor has simply died or isn't programmed properly. You can attempt to reprogram them (there are a few guides on how to do this here and online) first and if that doesn't resolve the issue you possibly need to purchase new sensors.

Indeed though before you proceed with any of the above it may also be beneficiary to clean ALL the car's chassis grounds which often alleviates communications issues the PCM and EBCM creates on start up. Bill Curlee has a very good write-up on ground location and servicing:

https://www.corvetteforum.com/forums...tion-long.html

 

With all those codes being history codes, I would reset them all and take the car for a good long drive. Then BEFORE you turn the car off recheck and see if any came back. Those will be the ones to be concerned about.

 

 

Thanks for your Input.

I had to order new TPMS sensors. No big deal. Needed new tires, anyway.

I cleared all codes except c1214hc wouldn't. It just keeps coming back. Any suggestions?

I dont know if it's related, but today I went to start the vette and it was dead. My son drove it a few days ago and may have left the aftermarket radio on. Can't be positive. But, Charged the battery and then started. I tested the alternator voltage and found it at 15.3, which, I believe, is higher than it should be. Could the alternator or regulator be bad causing damage to the battery? Could this be causing any issues with the EBCM?

Again, thanks for any assistance.

 

Any or the ABS fixers can replace the relay and take care of the C1214 problem. If you are handy with a soldering iron you might attempt the repair yourself following this thread. https://www.corvetteforum.com/forums...r-fleabay.html

IF you need to replace the alternator it is better to have your original rebuilt instead of getting a new or rebuilt aftermarket. On a C5 it can be difficult or expensive finding one that keeps the PCM happy and functions correctly. Do a search on charge system fault problems.

 

Have the battery load tested. C5's are very sensitive to voltage fluctuations. Replace with a good brand that meets the needs of the car if needed. The EBCM can be fixed by following the directions found on this site or sending it in to ABS fixers. Ok to drive the car without it but the abs ect will not be functional.

 

I just experienced the C1214 code thing with my 2002 Z06. Error message on the DIC was TC, ABS and AH. I could clear it with reset and drive the car, but every ignition cycle it would come back. I did the easy checks on the battery condition and grounds on the LH frame rail, but finally accepted that it was the EBCM.

I followed the instructions and removed the EBCM. It took about 2 hours and another 2 hours to open the case to get at the PCB. I could do it again in under 30 minutes.

Under a microscope it was plain to see the cracks and corrosion in many of the solder joints. I was told by our solder tech that this was due to lack of flux and lead free solder. It took him about 30 minutes to clean and re-flow most of the joints. He wicked the old solder out of one joint several times until he was satisfied. He told me that just re-flowing the solder joints without cleaning with flux might just be a temporary fix. I think that using a service like ABSfixer to repair this is a pretty good idea for most people.

I removed the air bridge, magnetized my T-20 Torx screwdriver and had it back in the car in about 10 minutes.