reduce engine speed light
Thread Starter
4th Gear
Joined: Jul 2005
Posts: 4
Likes: 0
reduce engine speed light
On the way home today from work my reduce engine light went on. I could not go over 40 mph. When ideling the engine sounds not very smooth. Whrn i press the gas pedal to the floor I get 2100 rpm only whats up.
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
You have a DTC code set that causes this issue! Read your codes and post them here!
Heres how!
This is the absolute best C5 Code web site!!!
http://www.corvettedoctor.com/Codes_Page.htm
Heres how!
This is the absolute best C5 Code web site!!!
http://www.corvettedoctor.com/Codes_Page.htm
Racer
Joined: Apr 1999
Posts: 483
Likes: 0
From: Nashville TN
Here is what I found for you
• DTC P1221 Throttle Position (TP) Sensor 1- 2 Correlation
• DTC P1220 Throttle Position (TP) Sensor 2 Circuit
• DTC P1120 Throttle Position (TP) Sensor 1 Circuit
• DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
SFS
• DTC P1221 Throttle Position (TP) Sensor 1- 2 Correlation
• DTC P1220 Throttle Position (TP) Sensor 2 Circuit
• DTC P1120 Throttle Position (TP) Sensor 1 Circuit
• DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
SFS
Team Owner
Joined: May 1999
Posts: 34,551
Likes: 505
From: Auburn Hills MI
Sounds like it must be the TAC module or the TPS sensor.
Mine is on the way, I get the same set of codes, along one that correlates directly to the TAC module.
I'd replace the TPS sensor first, its cheap, $40-50 or so, and if that doesn't work, replace the TAC module.
I paid $207 for my TAC module from Fitchner, just call it an Electronic Throttle Actuator Module, GM changed the name in the parts book.
The TPS sensor will take you 2 minutes to change, you just need some safety hex drives. They are standard hex drives with a small pin hole. Its on the passenger side of the TB and the connector points forward.
The TAC module, from what RoadRebel told me, is in the passenger side fender well. He said its a simple 1 hour job. I'll be doing mine tommorow night when the parts arrive.
Good Luck.
Mine is on the way, I get the same set of codes, along one that correlates directly to the TAC module.
I'd replace the TPS sensor first, its cheap, $40-50 or so, and if that doesn't work, replace the TAC module.
I paid $207 for my TAC module from Fitchner, just call it an Electronic Throttle Actuator Module, GM changed the name in the parts book.
The TPS sensor will take you 2 minutes to change, you just need some safety hex drives. They are standard hex drives with a small pin hole. Its on the passenger side of the TB and the connector points forward.
The TAC module, from what RoadRebel told me, is in the passenger side fender well. He said its a simple 1 hour job. I'll be doing mine tommorow night when the parts arrive.
Good Luck.
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Race Director
Joined: Sep 2004
Posts: 17,786
Likes: 4
From: Redsox, Pats, Celts & Bruins !!! Redsox Nation !!!
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
Before you do the above fixes try unplugging and replugging the TPS connector. Also try cleaning it with some no residue electronic cleaner. You can get the stuff at an electronics supply house or Radio Shack. Make sure it is non-residue.
Advanced
Joined: Apr 2005
Posts: 70
Likes: 0
From: Ashland OR
Originally Posted by NoOne
Sounds like it must be the TAC module or the TPS sensor.
Mine is on the way, I get the same set of codes, along one that correlates directly to the TAC module.
I'd replace the TPS sensor first, its cheap, $40-50 or so, and if that doesn't work, replace the TAC module.
I paid $207 for my TAC module from Fitchner, just call it an Electronic Throttle Actuator Module, GM changed the name in the parts book.
The TPS sensor will take you 2 minutes to change, you just need some safety hex drives. They are standard hex drives with a small pin hole. Its on the passenger side of the TB and the connector points forward.
The TAC module, from what RoadRebel told me, is in the passenger side fender well. He said its a simple 1 hour job. I'll be doing mine tommorow night when the parts arrive.
Good Luck.
Mine is on the way, I get the same set of codes, along one that correlates directly to the TAC module.
I'd replace the TPS sensor first, its cheap, $40-50 or so, and if that doesn't work, replace the TAC module.
I paid $207 for my TAC module from Fitchner, just call it an Electronic Throttle Actuator Module, GM changed the name in the parts book.
The TPS sensor will take you 2 minutes to change, you just need some safety hex drives. They are standard hex drives with a small pin hole. Its on the passenger side of the TB and the connector points forward.
The TAC module, from what RoadRebel told me, is in the passenger side fender well. He said its a simple 1 hour job. I'll be doing mine tommorow night when the parts arrive.
Good Luck.
Bobby
Advanced
Joined: Apr 2005
Posts: 70
Likes: 0
From: Ashland OR
Originally Posted by ArKay99
Before you do the above fixes try unplugging and replugging the TPS connector. Also try cleaning it with some no residue electronic cleaner. You can get the stuff at an electronics supply house or Radio Shack. Make sure it is non-residue.
Bobby
Tech Contributor
Joined: Oct 1999
Posts: 40,995
Likes: 9,759
From: Charlotte, NC (formerly Endicott, NY)
If you replace parts based only on those codes you are just guessing. For each code there is an explanation of what causes the code to be set and usually a full page diagnostic procedure to help you figure out what may be setting the code.
The GM Service Manual is worth the $130 you pay for it.
Bill
The GM Service Manual is worth the $130 you pay for it.
Bill
Melting Slicks
Joined: Apr 2002
Posts: 2,631
Likes: 2
From: Clever, MO aka SOMO
Originally Posted by 05-STi
Let me know how it goes. I will need to replace mine next week. How do you get to the TAC module? Is it underneath the battery, or do I need to jack the car up and get to it from underneath the car. Please let me know where the TAC module is and how to get to it. Thanks,
Bobby
Bobby
Good luck,
