C5 Code p1221 please help!!
Intermediate
Joined: Jul 2022
Posts: 39
Likes: 8
From: TX
I know this thread is old but I am getting the P1221 code. I clear but comes back as soon as I start the car.
is the TPS the answer? I have read thru multiple threads and it seems to resolve the issue for some of you.
I have had nothing but problems with this car since I got. Can't remember all the codes I have had. I did take it to a loca speed shop and thought they had fixed them all. Only been able to run thru about 2 tanks of gas before this one started showing up.
it's a 03 Z06.
Any advice is appreciated.
A fellow car guy has suggested Holley Terminator X to resolve all my code issues. Any thoughts on that.
is the TPS the answer? I have read thru multiple threads and it seems to resolve the issue for some of you.
I have had nothing but problems with this car since I got. Can't remember all the codes I have had. I did take it to a loca speed shop and thought they had fixed them all. Only been able to run thru about 2 tanks of gas before this one started showing up.
it's a 03 Z06.
Any advice is appreciated.
A fellow car guy has suggested Holley Terminator X to resolve all my code issues. Any thoughts on that.
Last edited by Wcbrown1967; Nov 29, 2024 at 06:02 PM.
Tech Contributor
Joined: Jan 2007
Posts: 19,360
Likes: 1,127
From: Dyer, IN
I know this thread is old but I am getting the P1221 code. I clear but comes back as soon as I start the car.
is the TPS the answer? I have read thru multiple threads and it seems to resolve the issue for some of you.
I have had nothing but problems with this car since I got. Can't remember all the codes I have had. I did take it to a loca speed shop and thought they had fixed them all. Only been able to run thru about 2 tanks of gas before this one started showing up.
it's a 03 Z06.
Any advice is appreciated.
is the TPS the answer? I have read thru multiple threads and it seems to resolve the issue for some of you.
I have had nothing but problems with this car since I got. Can't remember all the codes I have had. I did take it to a loca speed shop and thought they had fixed them all. Only been able to run thru about 2 tanks of gas before this one started showing up.
it's a 03 Z06.
Any advice is appreciated.
Do you have a scanner and DMM for troubleshooting?
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,433
Likes: 3,981
From: Cape Coral, Florida
If you don’t have a scan tool that can look at or graph your TPS sensor voltages or you don’t have any electrical diagnostic knowledge find an auto electrical shop or diagnostic shop as they have the knowledge to diagnose this…your local “speed shop” doesn’t have this knowledge as well as most general repair shops or dealerships…the 1221 is a TPS “correlation “ DTC and if TPS 1 and 2 disagree by more than 7.5% the code sets…looking at all 6 wires of the TPS sensor for shorts or high resistance between it and the TAC module will be necessary.
Intermediate
Joined: Jul 2022
Posts: 39
Likes: 8
From: TX
I believe it was one of the codes they resolved. I did check with them but they claim they are swapped with winter projects. It's a very small but well respected shop. I will call them Monday and see if they will put me on thier schedule.
No I don't have the tools to really troubleshoot and electrical is definitely not my area.
Lol at stay away from my buddy. He said I would have more power and no more issues with code. I read some of the threads on the Terminator X here and it seems more for actaul race car. I just wanted a reliable weekend/good weather driver.
The codes that they fixed were P0481, P1221, P1220, P1515.
They did replace the TPS. Repaired wiring harness, replaced 02 sensor.
I had them install Corsa axel back and leaky slave cylinder. They also dyno tuned it.
it ran great for a few more months. I don't get to drive much as I work from home.
This work was done April of this year. I probably made a mistake by not driving more as soon as I got it back.
This car has been a money pit since I got it. Have owned Camaros for the last 20+ years. My 02 Z28 has been super reliable. Put 140k miles on it and drove it hard. Was hoping the Vette was gonna have the same reliability being from the same era of production form Chevrolet.
Thanks for the quick reply.
Wes
No I don't have the tools to really troubleshoot and electrical is definitely not my area.
Lol at stay away from my buddy. He said I would have more power and no more issues with code. I read some of the threads on the Terminator X here and it seems more for actaul race car. I just wanted a reliable weekend/good weather driver.
The codes that they fixed were P0481, P1221, P1220, P1515.
They did replace the TPS. Repaired wiring harness, replaced 02 sensor.
I had them install Corsa axel back and leaky slave cylinder. They also dyno tuned it.
it ran great for a few more months. I don't get to drive much as I work from home.
This work was done April of this year. I probably made a mistake by not driving more as soon as I got it back.
This car has been a money pit since I got it. Have owned Camaros for the last 20+ years. My 02 Z28 has been super reliable. Put 140k miles on it and drove it hard. Was hoping the Vette was gonna have the same reliability being from the same era of production form Chevrolet.
Thanks for the quick reply.
Wes
