Reduced Engine Power/Active Handling kicks in when accelerating
Thread Starter
Heel & Toe
Joined: Aug 2004
Posts: 24
Likes: 0
From: New Jersey
Reduced Engine Power/Active Handling kicks in when accelerating
I took my 2002 convertible out for a cruise yesterday and experienced an issue when I tried to accelerate onto a highway. The car instantly slowed down and engine power was dramatically reduced. 
The check Engine Light and the Active Handling System Light appeared and the chime started ringing. After this happened I found that I couldn't exceed 55 mph. I pulled over and turned the engine off. After a few minutes I started it up again and proceeded to drive home as gently as possible.
When I got home I found the following codes in the DIC:
10-PCM: 1515H Control Module Throttle Actuator Position Performance
28-TCS: C1278H TCS Temporarily Inhibited By PCM
60-IPC: U1255 Serial Data Line Malfunction
I ran a search and it seems that it might be a problem with the PCM, electrical system, throttle sensor or PCM. I've heard about electrical gremlins in the C5 but I didn't find any other posts stating that their problems were triggered by acceleration. Any ideas guys???
The check Engine Light and the Active Handling System Light appeared and the chime started ringing. After this happened I found that I couldn't exceed 55 mph. I pulled over and turned the engine off. After a few minutes I started it up again and proceeded to drive home as gently as possible. When I got home I found the following codes in the DIC:
10-PCM: 1515H Control Module Throttle Actuator Position Performance
28-TCS: C1278H TCS Temporarily Inhibited By PCM
60-IPC: U1255 Serial Data Line Malfunction
I ran a search and it seems that it might be a problem with the PCM, electrical system, throttle sensor or PCM. I've heard about electrical gremlins in the C5 but I didn't find any other posts stating that their problems were triggered by acceleration. Any ideas guys???
Last edited by Antonio; Apr 16, 2006 at 09:39 AM.
Burning Brakes
Joined: Sep 2004
Posts: 1,056
Likes: 0
From: Havelock, NC ( NJ Resident )
Originally Posted by Antonio
I took my 2002 convertible out for a cruise yesterday and experienced an issue when I tried to accelerate onto a highway. The car instantly slowed down and engine power was dramatically reduced. The check Engine Light and the Active Handling System Light appeared and the chime started ringing. After this happened I found that I couldn't exceed 55 mph. I pulled over and turned the engine off. After a few minutes I started it up again and proceeded to drive home as gently as possible.
When I got home I found the following codes in the DIC:
10-PCM: 1515H Control Module Throttle Actuator Position Performance
28-TCS: C1278H TCS Temporarily Inhibited By PCM
60-IPC: U1255 Serial Data Line Malfunction
I ran a search and it seems that it might be a problem with the PCM, electrical system, throttle sensor or PCM. I've heard about electrical gremlins in the C5 but I didn't find any other posts stating that their problems were triggered by acceleration. Any ideas guys???
The check Engine Light and the Active Handling System Light appeared and the chime started ringing. After this happened I found that I couldn't exceed 55 mph. I pulled over and turned the engine off. After a few minutes I started it up again and proceeded to drive home as gently as possible. When I got home I found the following codes in the DIC:
10-PCM: 1515H Control Module Throttle Actuator Position Performance
28-TCS: C1278H TCS Temporarily Inhibited By PCM
60-IPC: U1255 Serial Data Line Malfunction
I ran a search and it seems that it might be a problem with the PCM, electrical system, throttle sensor or PCM. I've heard about electrical gremlins in the C5 but I didn't find any other posts stating that their problems were triggered by acceleration. Any ideas guys???
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
Examine the throttle body throttle blade and make sure that it is free to go to the full open and shut position. 
You should be able to push it fully open with your finger and it should rotate to the almost fully shut position when you release it (*with the engine and key in the OFF position*) Clear the codes and turn on the key. With the ENGINE OFF Have someone depress the accelerator slowly and watch the throttle blade. It should go from the fully shut to the full open position and not stick or studded.
BC
You should be able to push it fully open with your finger and it should rotate to the almost fully shut position when you release it (*with the engine and key in the OFF position*) Clear the codes and turn on the key. With the ENGINE OFF Have someone depress the accelerator slowly and watch the throttle blade. It should go from the fully shut to the full open position and not stick or studded.
BC
