act handling warming up Help
Thread Starter
3rd Gear
Joined: Jun 2004
Posts: 3
Likes: 0
From: vancouver bc
act handling warming up Help reduce engine power lots of problems help pls
hello im new here and need some help pls.
i recently changed my rear left shock because my active handling stop working. now that i've changed it after a few minutes of driving i get active handling warming up with no codes being displayed. ive tried reseting but it still pops up again if i leave it for about twenty min dic tell me to service active handling ( gm told me to change the shock and i did witch turned of the handling and abs light. can some one tell me what act handling warming up is or what i should do. also i get reduce engine power when i go over sever bumps. thank
Codes
10 PCM
P 0410
p0420 c
-------------
when reduce engine power comes on these are the codes help pls
PCM
c P1125 APP System
P1281 APP Sensor 2 Circuit Performance
C 1278 c under TCS Temporarily Inhibited By PCM
what is APP
Tcs
c1283 c
i recently changed my rear left shock because my active handling stop working. now that i've changed it after a few minutes of driving i get active handling warming up with no codes being displayed. ive tried reseting but it still pops up again if i leave it for about twenty min dic tell me to service active handling ( gm told me to change the shock and i did witch turned of the handling and abs light. can some one tell me what act handling warming up is or what i should do. also i get reduce engine power when i go over sever bumps. thank
Codes
10 PCM
P 0410
p0420 c
-------------
when reduce engine power comes on these are the codes help pls
PCM
c P1125 APP System
P1281 APP Sensor 2 Circuit Performance
C 1278 c under TCS Temporarily Inhibited By PCM
what is APP
Tcs
c1283 c
Last edited by pafrooz; Jul 21, 2004 at 05:08 PM.
Melting Slicks
Joined: Apr 2001
Posts: 2,877
Likes: 7
I can shed a little bit of light on the active handling warming up issue I think.. You will get that message when ever you start the car and drive a bit at slow speed, under 10 or 12 miles and hour. I get this message when I take my Z to work and I am driving around the parking lot at slow speeds after work. It is normal and nothing to worry about if the message goes away after the warming is complete..
I don't have the manual at work
What does it say for
P0410 and P0420c???
I don't have the manual at work
What does it say for
P0410 and P0420c???
Le Mans Master
Joined: Aug 2000
Posts: 8,762
Likes: 2
From: Murphy TX
AH Warming up typically shows up if you are TURNING within the first XX feet (I don't know exactly how many). Parking lot/garage is a good example - the AH calibrates with a straight wheel.
I've not heard of this lasting more than a few seconds though. As soon as you straighten out for a bit it should go off.
Sounds to me maybe an electrical problem or a bad sensor on one of the wheels... sorry I can't help much more.
I've not heard of this lasting more than a few seconds though. As soon as you straighten out for a bit it should go off.
Sounds to me maybe an electrical problem or a bad sensor on one of the wheels... sorry I can't help much more.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
You need to get yourself a GM Service Manual so you can read the code descriptions, what causes them to be set and the diagnostic procedures related to them. My manual is for a 97 so does not have some of the codes you have posted.
The P0410 (can't tell if it is current "c" or "h" from your post) is a PCM code indicating you have a problem with the Air Injection Reaction System.
The P0420 C is a current Vs historical PCM code indicating you have a catalytic convertor problem.
The P1125 code indicates a problem with the Accelerator Pedal Position (APP) sensors. This code will not be set unless two or more of the 3 sensors are out of range, disagree, etc. When that happens the code is set and you get reduced engine power.
The C1278 C is a current code indicating that the PCM sees something wrong with one or more of the parameters it monitors (probably the parameters that are causing the two PCM 04 series codes to be set) and has shut down Traction Control. The code is used for diagnostic purposes to tell the tech there is nothing wrong with the ABS/TCS system (in your case the ABS/AH system).
Bill
The P0410 (can't tell if it is current "c" or "h" from your post) is a PCM code indicating you have a problem with the Air Injection Reaction System.
The P0420 C is a current Vs historical PCM code indicating you have a catalytic convertor problem.
The P1125 code indicates a problem with the Accelerator Pedal Position (APP) sensors. This code will not be set unless two or more of the 3 sensors are out of range, disagree, etc. When that happens the code is set and you get reduced engine power.
The C1278 C is a current code indicating that the PCM sees something wrong with one or more of the parameters it monitors (probably the parameters that are causing the two PCM 04 series codes to be set) and has shut down Traction Control. The code is used for diagnostic purposes to tell the tech there is nothing wrong with the ABS/TCS system (in your case the ABS/AH system).
Bill
Last edited by Bill Dearborn; Jul 22, 2004 at 12:31 AM. Reason: Add info
Intermediate
Joined: May 2004
Posts: 44
Likes: 0
From: Shawnee KS
You can get all the codes and how to use the DIC at HALTECH's site: http://www.corvettec5.com/installinfo.html
Good luck.
Good luck.
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
The problem is that it is just a list of codes and is not much use in diagnosing any problem. You need to know the conditions that can cause a code to set and the diagnostic procedures that need to be followed. Not all of them require a Tech 2. The manual helps you understand the logic of the person who designed the on board diagnostics and helps you get to the root cause of a problem where as having a code without any explanation is incrementally better than useless.
Thread Starter
3rd Gear
Joined: Jun 2004
Posts: 3
Likes: 0
From: vancouver bc
That guy's but the problem i'm having is that i know what these codes mean and ive done everything gm has asked me to like replaced the rear left shock and from wheel speed sensor. i dont understand why after all that i get reduce engine power and actv hadling warming up it does not go away. the reduce engine power on some days it does it just once but other days 30 times in 10 min. it gives me app codes. Gm cant figure out what it is because it never does it when i take it to them. is there a way to adjust the app.c P1125 APP System
P1281 APP Sensor 2 Circuit Performance
thanks
P1281 APP Sensor 2 Circuit Performance
thanks
