I have a 2000 6 Spd. Coupe with 22K miles on it. I am the 3rd owner. I typicaly don't drive the car much, about once a week but have been driving it more the last couple of weeks. About a week ago I started seeing a message on the DIC that says "Active Handling Warming Up" and the traction control indicator lights up. After about 10-15 minutes I get a message indicating the warmup is complete and the TC light goes out. If I shut the car off for a few minutes, it goes through the same sequence when I start it again.

On the same day that I started seeing the traction control msg, I started getting a check engine light.
I get 2 PCM codes, P0113 and P1111 both indicating a a high voltage on the Intake Air Temp (IAT) sensor circuit. I don't see how the two are related except that they started happening the same day.

Here is the scenario when I get the check engine light.
No check light when car is first driven when cold. I have driven 85 miles and not seen the light. I stop and shut the car off for some period ranging from 5 minutes to 1/2 hour. Start the car and begin driving. At some period of time ranging from a few minutes to 10 minutes or so, the check engine light comes on the the 2 PCM codes mentioned previously.

Could I have a bad ground somewhere that is causing these intermittant codes and messages? That's where I'm going to start looking before I take it to the dealer. I checked that battery and it's putting out 12.7V so it appears OK.

Is there anything else I should look for?

Thanks,

Rich

 

Actually, 12.7v is low for a car battery. It should be in the 13s.
But I'd expect you'd have trouble starting the car (do you?) if the
battery was low. What does it read when the car is running?
It should be in the 14s.

There is definitely some sort of problem, because the warm up
message should just take a minute or two, once you drive the
car a couple hundred yards or so.

Hard to say if the IAT codes are related or not. It could be that
your steering position sensor is starting to poop out, any other
history codes of interest?

 

The car starts right up. The battery was new but discharged when I bought the car 1 1/2 years ago as the the guy I bought it from rarely drove it.

There were a couple of history codes when I first got the check engine light but they were not related to the drivetrain so I noted them and then cleared them so I would have a new starting point.

I'll check the battery again with the car running ans see what it reads.

Thanks,

Rich

 

The air charge temp sensor is probably inop or disconnected. It is the small sensor on the intake tube just over the radiator. I left mine off after working on the intake and got the same messages.

Jeff

 

I have the same problem with my 2003 Vette. How do you see the engine codes? Do you need a special device or is it somewhere on the control panel. Can I see the history of codes easily.

Thanks Frank and Jill
jlinhart@comcast.net

 

Are you getting an Active Handling Warming Up message? I haven't heard of a Traction Control Warming Up message. The AH Warming up message occurs when the ABS system is trying to determine if the steering wheel is pointed straight ahead and the front wheels are also centered. It has to do this each time the engine is started. If the yaw or lateral G sensors do not provide a proper input the system may take some time to calibrate. If you are over 10 minutes you would probably get a C1283 code. A voltage outside the normal operating levels could cause errors with these sensors or the steering sensor which is used to determine steering center. The IAT high voltage problem could be caused by a poor ground at the PCM. So make sure your system voltage is correct and check the grounds for the battery, EBCM, PCM.

Bill

 

Yes, My bad. It is the Active Handling message.

 

I have been going through checking the grounding points. I cleaned the 2 GND points in the frame rail under the hood, verified the battery connections were clean and tight and also checked the grounding point nearest the PCM behind the kick panel on the passenger side. I'll check some others today as I still see the warmup message.

I'll also check the connection to the IAT sensor.

Does anyone know if clearing the PCM codes through the DIC actually reset the error condition. I'm wondering if I'm really seeing the IAT error more than once or if the repeated error is just history information that get reposted as the original error was never really cleared. I see a C and H displayed after the error.

 

You can display the codes through the DIC. You hold the Options button down and press the fuel button 4 times. It will cycle through all the systems and display any codes.

I found the information on the web and a listing of the codes. I saved them on my home PC. I'll email you a copy of what I saved.

Rich

 

How is the alignment on your car?? If the steering wheel is not straight as compared to the driving wheels or vise a versa. that has been known to cause the longer than normal warm up time.

 

The C means it is a current code and the H is for a History code.

Also have your alignment checked as Bill C recommended as an incorrect alignment can cause the problem.

Bill

 

Here is the link to the codes: http://www.corvettememphis.org/c5_computer_codes.htm

 

I have to have that checked out. It appears straight to me. I did put new tires on it back in March. The old tires showed even wear.

 

I reseated the connector. I'm picking up a new sensor to try today. I'll see if that corrects this issue or changes the symptoms at all.

 

I replaced the sensor an it made no difference. I took the car into the my local Chevy dealer and the replaced the IAT connector as they said that by wiggling the wires, they could generate the error codes.

There was also new PCM software available for that corrects a lot of false codes on the C5. They installed the update and the traction control warming up message disappeared. $240 later for mostly diagnostics, labor and a connector and my issues appear to be fixed. We'll see if this fix lasts longer term.

Thanks to all that replied with suggestions.

Rich