Help needed to diagnose these codes.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
Help needed to diagnose these codes.
I've had the car since October 09'. Had 27,800 miles when I drove it home. Almost 33K now so roughly 5000 miles since I got it. Before I got it home, it was at the Stealership getting brought up on mantenance. That's another story. No clue if they checked/cleared codes during/after the service. I've never checked.
When I first bought it I would avg 18 mpg per tank. Now 12???
Mods are as follows. Halltech Stinger, Corsa Indy Pace, ECS Mail Order Tune, New Wheels and tires (245/35R19 - 305/30R20)
All I did to get the codes listed below was turn the key to the on position. DID NOT START THE CAR.
PCM= P1431H / P1571H / P1626H / P1644H
TCS= NO CODES
RTD= NO COMM
BCM= B0844H / U1040H
IPC= B0521H / U1040H
RADIO= U1016H
HVAC= NO COMM
LDCM= B2282H / B2284H / U1064H
RDCM= B2253H / B2283H / B2285H / U1064H
SCM= NO COMM
RFA= NO CODES
When I first bought it I would avg 18 mpg per tank. Now 12???
Mods are as follows. Halltech Stinger, Corsa Indy Pace, ECS Mail Order Tune, New Wheels and tires (245/35R19 - 305/30R20)
All I did to get the codes listed below was turn the key to the on position. DID NOT START THE CAR.
PCM= P1431H / P1571H / P1626H / P1644H
TCS= NO CODES
RTD= NO COMM
BCM= B0844H / U1040H
IPC= B0521H / U1040H
RADIO= U1016H
HVAC= NO COMM
LDCM= B2282H / B2284H / U1064H
RDCM= B2253H / B2283H / B2285H / U1064H
SCM= NO COMM
RFA= NO CODES
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,599
Likes: 1,224
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
I've had the car since October 09'. Had 27,800 miles when I drove it home. Almost 33K now so roughly 5000 miles since I got it. Before I got it home, it was at the Stealership getting brought up on mantenance. That's another story. No clue if they checked/cleared codes during/after the service. I've never checked.
When I first bought it I would avg 18 mpg per tank. Now 12???
Mods are as follows. Halltech Stinger, Corsa Indy Pace, ECS Mail Order Tune, New Wheels and tires (245/35R19 - 305/30R20)
All I did to get the codes listed below was turn the key to the on position. DID NOT START THE CAR.
PCM= P1431H / P1571H / P1626H / P1644H
TCS= NO CODES
RTD= NO COMM
BCM= B0844H / U1040H
IPC= B0521H / U1040H
RADIO= U1016H
HVAC= NO COMM
LDCM= B2282H / B2284H / U1064H
RDCM= B2253H / B2283H / B2285H / U1064H
SCM= NO COMM
RFA= NO CODES
When I first bought it I would avg 18 mpg per tank. Now 12???
Mods are as follows. Halltech Stinger, Corsa Indy Pace, ECS Mail Order Tune, New Wheels and tires (245/35R19 - 305/30R20)
All I did to get the codes listed below was turn the key to the on position. DID NOT START THE CAR.
PCM= P1431H / P1571H / P1626H / P1644H
TCS= NO CODES
RTD= NO COMM
BCM= B0844H / U1040H
IPC= B0521H / U1040H
RADIO= U1016H
HVAC= NO COMM
LDCM= B2282H / B2284H / U1064H
RDCM= B2253H / B2283H / B2285H / U1064H
SCM= NO COMM
RFA= NO CODES
1431 "fuel level sensor performance"
1571 "traction control torque request circuit"
1626 "theft deterrent"
1644 "traction control delivered torque output cicuit
Either way, none of those are your problem, the car needs to be logged by a competent tech IMHO.
Last edited by DOUG @ ECS; May 24, 2010 at 07:37 PM.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
Are the codes I have to be concerned about. I get the infamous ABS traction control error every so often.
I'm gonna clear them and go for a spirited cruise and see what codes show after that.
I'm gonna clear them and go for a spirited cruise and see what codes show after that.
Safety Car
Joined: Jan 2001
Posts: 4,386
Likes: 689
From: Boise ID
Burning Brakes
Joined: Dec 2009
Posts: 963
Likes: 23
If you ever need to look up some codes real quick, here is a PDF that you can use. It has some definitions too.
http://www.vetteparts.se/nyheter/C5_DTC.pdf
http://www.vetteparts.se/nyheter/C5_DTC.pdf
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,599
Likes: 1,224
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Drifting
Joined: Oct 2003
Posts: 1,932
Likes: 4
From: Warrenville Il
This could be related to the aftermarket size wheels, if the tire height differences aren't within spec for what the computer is looking for, it may get confused. Just a thought, and it's not something to be to worried about. Just clear the code if and when it happens. Most of the time it will be put to an H code on the next start up and not reappear.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
This could be related to the aftermarket size wheels, if the tire height differences aren't within spec for what the computer is looking for, it may get confused. Just a thought, and it's not something to be to worried about. Just clear the code if and when it happens. Most of the time it will be put to an H code on the next start up and not reappear.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
I just cleared the codes and am about to head to the gym. I'm gonna try to drive it hard to and from. maybe a few miles max. When I pull into the driveway, I will check for codes with the engine running and with it off. I will post up my finding in a couple hours. Please check back if you think you can help with this.
Thanks for the help gentleman. gotta love this forum.
Thanks ECS for the continued customer service.
Thanks for the help gentleman. gotta love this forum.
Thanks ECS for the continued customer service.
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
So I cleared the codes and drove it pretty hard for a few miles to the gym and back.
Checked the codes while the motor was running, then turned it off, pulled the key and opened door, then turned to on and checked with motor off. Only 2 codes now and I got the same reading with the car running or off.
If I don't list a mode, it said no codes.
PCM P1571H
RTD NO COMM
RADIO U1016H
HVAC NO COMM
SCM NO COMM
Checked the codes while the motor was running, then turned it off, pulled the key and opened door, then turned to on and checked with motor off. Only 2 codes now and I got the same reading with the car running or off.
If I don't list a mode, it said no codes.
PCM P1571H
RTD NO COMM
RADIO U1016H
HVAC NO COMM
SCM NO COMM
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
Not sure about the radio one as it's a stock radio and works perfect. I'm gutting it and going all aftermarket so I assume it will always throw that code..
From a quick google search on the PCM code of P1571..... it looks like 97's throw it all the time. Not sure what to think of that though as I read you can't clear the code yet I can and then it comes back.
Back to my performance and gas mieage, is it possible my tune is off? Seems like if I had a problem big enough to cause a drop in mileage of 5-6 mpg, then it would toss a code??????
From a quick google search on the PCM code of P1571..... it looks like 97's throw it all the time. Not sure what to think of that though as I read you can't clear the code yet I can and then it comes back.
Back to my performance and gas mieage, is it possible my tune is off? Seems like if I had a problem big enough to cause a drop in mileage of 5-6 mpg, then it would toss a code??????
Thread Starter
Melting Slicks
Joined: Aug 2009
Posts: 2,785
Likes: 8
From: Sacramento California
ECS, what should I check next? Maybe my speedometer is still off. Not sure how I'm gonna check it though. I will try my GPS speedometer on my Droid and see if it matches up. Not that the I know for sure if the Droid is accurate......
Team Owner
Joined: Jul 2004
Posts: 24,652
Likes: 298
From: NJ
St. Jude Donor '05-'08
If you want to check your speedo get on a highway and do 60 mph then see how long it takes to do a mile (use the mile markers and time it). It should be 1 min. anything way outside of that means your speedo is off.
Drifting
Joined: Oct 2003
Posts: 1,932
Likes: 4
From: Warrenville Il