Reduced Engine Power warning at track
Premium Supporting Vendor
Joined: Oct 2001
Posts: 8,392
Likes: 573
From: Dallas Tx
St. Jude Vendor Donor '03-'04-'05-'06-'07-'08-'09-'10-'11
Guys, one of the issues is that the air leaving the intercooler is at 220 degrees which raises your IAT. not only does it lose power but it triggers much more.
LG
LG
Burning Brakes
Joined: Nov 1999
Posts: 1,221
Likes: 59
From: Abingdon VA
Thread Starter
Racer
Joined: Nov 2012
Posts: 396
Likes: 78
Thread Starter
Racer
Joined: Nov 2012
Posts: 396
Likes: 78
UPDATE: GM installed recording device in my car and I tracked it at Pocono on Friday morning to test. Car hit 172.6mph on lap 1 but then CEL and Reduced Engine power came on on next straight in 5th gear at 148mph. They have the data and we should know exactly what is going on by Tuesday. Stay Tuned!
Racer
Joined: May 2016
Posts: 405
Likes: 82
From: Richardson
UPDATE: GM installed recording device in my car and I tracked it at Pocono on Friday morning to test. Car hit 172.6mph on lap 1 but then CEL and Reduced Engine power came on on next straight in 5th gear at 148mph. They have the data and we should know exactly what is going on by Tuesday. Stay Tuned!
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Burning Brakes
Joined: Nov 1999
Posts: 1,221
Likes: 59
From: Abingdon VA
UPDATE: GM installed recording device in my car and I tracked it at Pocono on Friday morning to test. Car hit 172.6mph on lap 1 but then CEL and Reduced Engine power came on on next straight in 5th gear at 148mph. They have the data and we should know exactly what is going on by Tuesday. Stay Tuned!
Pro
Joined: Feb 2014
Posts: 581
Likes: 218
From: Ontario Canada
UPDATE: GM installed recording device in my car and I tracked it at Pocono on Friday morning to test. Car hit 172.6mph on lap 1 but then CEL and Reduced Engine power came on on next straight in 5th gear at 148mph. They have the data and we should know exactly what is going on by Tuesday. Stay Tuned!
Hope they figure out your issue because I have a feeling it's the same issue that I'm having.
Mark
Thread Starter
Racer
Joined: Nov 2012
Posts: 396
Likes: 78
I'm curious too. I continue to have essentially the same issue, except it's not related to "speed" but rather to load (100%) and throttle position (wide open)... Dealer has had the car for 12 days now and been in constant contact with GM who "is working on the issue". GM has told the dealer that they are experiencing this "issue" with other car owners, so I'm not alone (no ****)... but in the meantime I don't have a car and my next track day is fast approaching.
Hope they figure out your issue because I have a feeling it's the same issue that I'm having.
Mark
Hope they figure out your issue because I have a feeling it's the same issue that I'm having.
Mark
I fully expect GM to resolve this as I now have the ear of the top people in Corporate. As soon as they contact me I will post. Several of us are having the same issue and I am confident GM will find the source.
Le Mans Master
Joined: May 2000
Posts: 8,729
Likes: 1,508
From: Redmond WA
I wonder to what extent we'll actually find out what's going on? We'll certainly find out what the ultimate fix is, and that may make it obvious, but if it comes out as calibration update outside of the base tables (ie: a code bug, which is what I kind of expect) we may just never know!
I fixed one once in the old LT1 (1990s) code, and it wasn't in a "table", it was in some code that checked wheel speed sensor acceleration, and if it was more than some baked in "Can never happen" constant (my car was so fast it was impossible! :-) ), it'd stop shifting and go into limp mode. And that was in the microcontroller code, not a table, so wouldn't show up in a (modern) HPTuners delta, for example.
I fixed one once in the old LT1 (1990s) code, and it wasn't in a "table", it was in some code that checked wheel speed sensor acceleration, and if it was more than some baked in "Can never happen" constant (my car was so fast it was impossible! :-) ), it'd stop shifting and go into limp mode. And that was in the microcontroller code, not a table, so wouldn't show up in a (modern) HPTuners delta, for example.
Last edited by davepl; Jul 25, 2017 at 12:32 PM.
Thread Starter
Racer
Joined: Nov 2012
Posts: 396
Likes: 78
I wonder to what extent we'll actually find out what's going on? We'll certainly find out what the ultimate fix is, and that may make it obvious, but if it comes out as calibration update outside of the base tables (ie: a code bug, which is what I kind of expect) we may just never know!
I fixed one once in the old LT1 (1990s) code, and it wasn't in a "table", it was in some code that checked wheel speed sensor acceleration, and if it was more than some baked in "Can never happen" constant (my car was so fast it was impossible! :-) ), it'd stop shifting and go into limp mode. And that was in the microcontroller code, not a table, so wouldn't show up in a (modern) HPTuners delta, for example.
I fixed one once in the old LT1 (1990s) code, and it wasn't in a "table", it was in some code that checked wheel speed sensor acceleration, and if it was more than some baked in "Can never happen" constant (my car was so fast it was impossible! :-) ), it'd stop shifting and go into limp mode. And that was in the microcontroller code, not a table, so wouldn't show up in a (modern) HPTuners delta, for example.
Burning Brakes
Joined: Nov 1999
Posts: 1,221
Likes: 59
From: Abingdon VA
The thing that makes me think it's a programming issue is 2017's have installed a CAI and immediately trigger a p0106 code. Take the CAI off and the code goes away. Plus the map sensitivity table was changed in 2017. Obviously some 2017's are setting the code pure stock under load. Both facts points to a programming issue.
Thread Starter
Racer
Joined: Nov 2012
Posts: 396
Likes: 78
The thing that makes me think it's a programming issue is 2017's have installed a CAI and immediately trigger a p0106 code. Take the CAI off and the code goes away. Plus the map sensitivity table was changed in 2017. Obviously some 2017's are setting the code pure stock under load. Both facts points to a programming issue.
Is your car stock?
Are you having any issues?
What speeds do you get on the track?
Burning Brakes
Joined: Nov 1999
Posts: 1,221
Likes: 59
From: Abingdon VA
Race Director
Joined: Jan 2005
Posts: 10,924
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From: Daytona Beach FL
Standing by anxiously for the complete, entire, full, thorough, replete, lock stock and barrel, unabbreviated, unabridged, uncondensed, uncut, whole enchilada, whole-hog explanation from GM.
But, I'm not very confident we're gonna get it!!!
If they do come up with a problem that may be across the whole model year, I hope they'll be offering a solution to every owner of the affected cars!!
Hope you got some good news!!
.
But, I'm not very confident we're gonna get it!!!
If they do come up with a problem that may be across the whole model year, I hope they'll be offering a solution to every owner of the affected cars!!
Hope you got some good news!!
.