TCP codes
Thread Starter
4th Gear
Joined: Sep 2017
Posts: 4
Likes: 0
TCP codes
I have a 2001 coupe with a newly installed ls3 crate ( less than 600 miles) I just changed the oil and filter. I ran it to the car wash and upon leaving the car wash,the dic posted: REDUCED ENGINE POWER, SERVICE ACTIVE HANDLING. the check engine light came on and the traction control icon were on. I " limped" her home figured something got wet so let her dry out over night. I did NOT wash the engine bay. This morning same problem ran dic diagnostics got the following codes: P1120, P1220, P1221 and P1516 the reduced engine power and service active handling prompts are still on as well as the check engine and traction control lights. HELP!!
Administrator
Joined: Mar 2001
Posts: 368,522
Likes: 24,823
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '26
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
Moved to C5 Tech.
Melting Slicks
Joined: Nov 2009
Posts: 2,922
Likes: 219
From: West Branch, MI
All of the codes you got were from a Throttle Position Sensor (TPS) problem. They might or might not be related to the car wash. Simply clear all those codes and see if the problem goes away. Since you've put in an LS3, did you use a LS3 or LS2 TB or are you still using the original LS1 TB? Hint: when the TPS throws a code it sets the Check Engine Light, Traction Control lights, etc. Clear all the codes and then see if you're good to go.
Last edited by CactusCat; Oct 22, 2017 at 03:56 PM.
Thread Starter
4th Gear
Joined: Sep 2017
Posts: 4
Likes: 0
TPS codes
I also just noticed that you're very new here. If you don't know how to read, check and clear you codes, here's how.
https://www.youtube.com/watch?v=SviRjIsy9G4
https://www.youtube.com/watch?v=SviRjIsy9G4
Drifting
Joined: Sep 2009
Posts: 1,862
Likes: 595
From: Prescott, Arizona
It is not clear to me whether the TPS is an LS3 or an LS1 TPS. Making an LS3 TPS work requires some rewiring off the system and there is a lengthy post on how to do that:
https://www.corvetteforum.com/forums...y-on-a-c5.html
Otherwise, here is something where Bill Curlee shows how to do some diagnosis on a problem with similar codes-
https://www.corvetteforum.com/forums...ine-power.html
https://www.corvetteforum.com/forums...y-on-a-c5.html
Otherwise, here is something where Bill Curlee shows how to do some diagnosis on a problem with similar codes-
https://www.corvetteforum.com/forums...ine-power.html
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Melting Slicks
Joined: Nov 2009
Posts: 2,922
Likes: 219
From: West Branch, MI
You'll notice I asked which TB you were using in my first reply to you. If your crate motor came with an LS3 TB, you may need to swap it for an LS2 TB. Easy way to tell is look at the throttle body blade. Gold blade = bad, silver blade = good. Many threads about this. Who did the install of the crate motor? Obviously, it takes some know how to get the LS3 working properly in a C5. The stock reluctor wheel on an LS3 is 58 tooth and you have to replace with a 24 tooth or you have to install a 58 to 24 converter box from Lingenfelter. It isn't an exact swap out. I know as I also have an LS3 in my 98. A little bit more info is needed.
Thread Starter
4th Gear
Joined: Sep 2017
Posts: 4
Likes: 0
You'll notice I asked which TB you were using in my first reply to you. If your crate motor came with an LS3 TB, you may need to swap it for an LS2 TB. Easy way to tell is look at the throttle body blade. Gold blade = bad, silver blade = good. Many threads about this. Who did the install of the crate motor? Obviously, it takes some know how to get the LS3 working properly in a C5. The stock reluctor wheel on an LS3 is 58 tooth and you have to replace with a 24 tooth or you have to install a 58 to 24 converter box from Lingenfelter. It isn't an exact swap out. I know as I also have an LS3 in my 98. A little bit more info is needed.
6th Gear
Joined: May 2012
Posts: 6
Likes: 0
From: lake orion Michigan
Help
I had a very reputable shop do the work all the above was done correctly and then tuned no problems what so ever. I am very convinced that something has gotten wet and that's what I need to find out. The shop is about 60 miles away and I don't want to have it towed back unnecessarily. The owner is trying to help me with the problem now.
dis you ever find out what was getting wet? Having the same problem
Melting Slicks
Joined: Sep 2021
Posts: 2,555
Likes: 1,213
