2002 Z06, A&A S/C, Headers, Stock Bottom end.

Just got the car back from tuner. When I picked it it had a ton of codes. He assured me that this happens some time during tuning. I cleared them and all has been well for past few days.

Took the car out today and during heavy acceleration the car fell on it's face and I limped it home. The following message and codes were given:

Service active handling
Reduced engine power
PCM-1514
TSC C1278 H
Radio U1096H
LDCM U1064H
RCDM U1064H
SCM U1255H

Clear cool day no water no recent washes

I turned off the car, removed key. Re-inserted key cleared the codes. Took the car back out ran fine. This is scary, if this continues.

Thanks for any help

 

I have not ran the codes yet on mine, but I have the same mods you have and so far I have the service active handling and reduce engine power. Assuming the radio code, does your radio just turn off?

 

I do not know, I had it off when this happened. Based on some other posts I believe this is being caused by something in the tune. I will be talking with my tuner tomorrow and will post any information.

 

I would suggest the following:
1) clear all of the codes
2) drive the car and see which codes come back
3) post the codes that do come back
4) discuss P1514 specifically with your tuner...see if anything in the process led to that code being triggered

Here's some additional info:
P1514 is TAC System MAF Performance. This code will trigger when the PCM detects that the difference between the actual airflow (reported by the MAF) and the Speed a Density calculated airflow is greater than expected. It seems to me like this code is directly related to the tuning. Did your tuner use a Speed Density tune? Or is the MAF still active?
U1255 H is a serial data line malfunction. If an open or short (to ground or voltage) was detected prior to ignition ON for 1 second, this code will set.
U1064 is loss of communication with the BCM
U1096 is loss of communication with the IPC
I suspect that all of your U codes are related. I would check your wiring connections between the various modules and the serial data bus. Check your star connectors, too. Test your power and ground circuits for continuity and proper resistance.
C1278 is TCS Temporarily Inhibited by PCM. Not 100% sure! but I think this code may have been set when you went into Reduced Engine Power (which happens when P1514 sets). C1278 will also trigger the Service Active Handling message.

Hope this helps...

 

I checked my codes, have well over 25 of them ! Not good haha, most of them are stuff related to the PCM

 

Tuner did tune to MAF. He made an adjustment but on the way home same thing. I did have a radio code just prior to getting the second & third 1514. Any chance the radio code is related to the 1514, my tuner says probably not.

 

Thanks Sunchaser, but this may be over my head. Is there a written procedure somewhere I could follow to perform the tests you are suggesting?

 

Your U codes are Serial Bus related. Based on the earlier codes I saw it may be as simple as the wiring in one of the doors is crimped and faulting the bus. An easy way to check is to open a door and pull back the accordion tube the wiring runs in and look at the connector and wiring in the door. There are some links for this, could not find it in my bookmarks here at home.

For some more reading on this here is a good Thread to start your head spinning.

http://forums.corvetteforum.com/c5-t...t-there-3.html

 

The door accordion wiring issue can cause all kinds of havoc...happened to me...the car would just die for no reason...there is a wire in there where some of the actual wire is exposed...needs to be well wrapped with good electrical tape...fixed my issue. Tuning itself should not produce any codes.

 

Thanks for the info guys I will check it out. I hope it is that easy.

 

The door issue is not or normally not wiring related as much as it is CONNECTOR "Female Pin" RELATED!!!!

The Female Pins in the connectors spread and make a POOR GRIP on the male pins. Anything that causes a vibration or the connector to move, or disturb the connection (heavy acceleration ) causes the Door Control Modules loose power momentarily and that that corrupts the serial data buss.

The next time it happens,, see if you have a failure of either one or both door modules. Like the window wont roll down or the buttons stop working.

Either way, its a VERY GOOD idea to remove the accordion tube, separate the connectors and see if you have any spread or deformed female pins.

You can use a metal pick and vend the tong back to make positive connection with the male pin. Its best to get a spare male pin and do a PIN PULL TEST to see if you have any female pins that are making poor connection.

CLEAR ALL of the DTCs and monitor.

Bill

 

Bill, good info. Do you have the Delphi part numbers for the male and female portions?

 

Thanks Bill I will do that. Do you think the "U" codes and the 1514 could be related. I am thinking no because I had a "U" code in history before the 1514 was thrown. I ask, because I am schedule to go back to the tuner and want to make sure the "U" is not contributing to the 1514.

Thanks

Randy