Reduced Enging Output warning, Service Department at a loss - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

DrSpange · 03-01-2012, 09:25 AM

I've been having a problem with my 2010 RS for the past 4 weeks and have taken it to get serviced 4 times already.

When driving (usually when accelerating) I'll get a "Service Stabilitrack" followed by "Service Parking Assist" followed by the check engine light. Then I get "Reduced engine output" and the car will sputter and almost stall as it tries to shift gears.

I was told the car is throwing out so many codes the "internal computer" is overwhlemed and cannot focus on shifting gears. Consequently I'll be nearly flooring it, but going only 45mph with 7000rpm as the car has difficutly shifting gears.

Has this happened to anyone else? The Service Depatment guys have called GM tech support and apparently this problem hasn't been reported. Worst of all, it happens sporadically, so unless they can get the car to reproduce the same issues (which they haven't been able to do despite putting about 200miles on my car) they say they can't fix it, because there are too many codes and they can't tell which one is the actual problem.

Any suggestions?

jasycz28 · 03-01-2012, 09:37 AM

If you still have a warranty follow these steps

Step one: Have the dealership fix ALL the codes the computer has.
Step two: Drive fixed car

DrSpange · 03-01-2012, 10:43 AM

JSick,
Thanks, but I already did that 3 times.
Every time they "fix" or address all the codes and give me back the car, I drive it a couple days and it happens again.

Qtrofablock · 03-01-2012, 10:49 AM

Happend to me last week in my 12, but no other codes except fuel rail sensor, (i really hope thats the correct name) ne way, had it from thurs to tues! also it made my TC/stabilitrack shut down......but they got her right? dont know if yours is the same.....but mine had reduced engine power when it happened! called onstar immediately, they diagnosed it b4 the dealer....! Hope all gets fixed!

Juiced1 · 03-01-2012, 10:56 AM

Huge problem on GM cars. I would put money on a short. Any short usually triggers the limp mode which is probably the dumbest thing on the planet. My wifes car would get this when it snowed or rained. I took epoxy and poured it over all electric connections that I could and it hasn't done it since. The short her car was having was related the the gas pedal and ecm connection. A short would cause a voltage difference between the two. Since they messure throttle off of voltage now, when their is a difference you get limp mode. Before I got it fixed my wife would drive with my obd2 code scanner. When it would go into limp mode she would pull over and erase the codes and go. Not sure if this is the same problem you're having but the scanner helps and it's most likely a short similar to what we had.

SC2150 · 03-01-2012, 10:59 AM

They are giving you a bunch of bull on "the computer overwhelmd so cant shift".

In reduced power mode (limp mode) the car is in a protect mode so you can still drive somewhat. They should know this.

I suspect a bad connection on a wheel sensor, TB harness, or trans related. Not hard to diagnose or repair if you get to a dealer with skilled techs that know what they are doing.

Chevrolet Customer Svc · 03-01-2012, 12:52 PM

DrSpange, you may want to try having the vehicle checked over by another dealer just to see if new eyes on the subject might shed some light and help with getting this issue resolved for you. If you don't have any other close dealers to you let me know and I'll do what I can to help with this.

Jeff Morris, Chevrolet Customer Service

03-01-2012, 09:25 AM	#1
DrSpange Drives: 2010 Camaro RS Join Date: Mar 2012 Location: Oklahoma Posts: 4	Reduced Enging Output warning, Service Department at a loss I've been having a problem with my 2010 RS for the past 4 weeks and have taken it to get serviced 4 times already. When driving (usually when accelerating) I'll get a "Service Stabilitrack" followed by "Service Parking Assist" followed by the check engine light. Then I get "Reduced engine output" and the car will sputter and almost stall as it tries to shift gears. I was told the car is throwing out so many codes the "internal computer" is overwhlemed and cannot focus on shifting gears. Consequently I'll be nearly flooring it, but going only 45mph with 7000rpm as the car has difficutly shifting gears. Has this happened to anyone else? The Service Depatment guys have called GM tech support and apparently this problem hasn't been reported. Worst of all, it happens sporadically, so unless they can get the car to reproduce the same issues (which they haven't been able to do despite putting about 200miles on my car) they say they can't fix it, because there are too many codes and they can't tell which one is the actual problem. Any suggestions?

03-01-2012, 09:37 AM	#2
jasycz28 J.Sick Drives: 2010 Camaro SS Join Date: Nov 2010 Location: Ardmore, OK Posts: 965	If you still have a warranty follow these steps Step one: Have the dealership fix ALL the codes the computer has. Step two: Drive fixed car __________________ "J.Sick" 2010 Camaro 2SS

03-01-2012, 10:49 AM	#4
Qtrofablock Drives: 12 LS M6 All Blk Join Date: Jul 2010 Location: Delray Beach,Florida Posts: 219 View My Garage	Happend to me last week in my 12, but no other codes except fuel rail sensor, (i really hope thats the correct name) ne way, had it from thurs to tues! also it made my TC/stabilitrack shut down......but they got her right? dont know if yours is the same.....but mine had reduced engine power when it happened! called onstar immediately, they diagnosed it b4 the dealer....! Hope all gets fixed! __________________ 2012LS 3.6L M6 All Black Custom mats by Llyods/ AAC colorshift 2.0 halos ,footwells/ HID/LEDS by AAC/ Aqua interior and trunk/ Black billet upper and lower grilles/ Black billet bowties.MRT V2/Magnaflow X pipe/Rx catch can and oil breather cap/ C.A.I. Intake/Scoop/ww relocater/Hurst Short Throw Shifter

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03-01-2012, 10:43 AM	#3
DrSpange Drives: 2010 Camaro RS Join Date: Mar 2012 Location: Oklahoma Posts: 4	JSick, Thanks, but I already did that 3 times. Every time they "fix" or address all the codes and give me back the car, I drive it a couple days and it happens again.

03-01-2012, 10:56 AM	#5
Juiced1 Account Suspended Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011 Location: St. Charles, IL Posts: 18,648	Huge problem on GM cars. I would put money on a short. Any short usually triggers the limp mode which is probably the dumbest thing on the planet. My wifes car would get this when it snowed or rained. I took epoxy and poured it over all electric connections that I could and it hasn't done it since. The short her car was having was related the the gas pedal and ecm connection. A short would cause a voltage difference between the two. Since they messure throttle off of voltage now, when their is a difference you get limp mode. Before I got it fixed my wife would drive with my obd2 code scanner. When it would go into limp mode she would pull over and erase the codes and go. Not sure if this is the same problem you're having but the scanner helps and it's most likely a short similar to what we had.

03-01-2012, 10:59 AM	#6
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 6,063	They are giving you a bunch of bull on "the computer overwhelmd so cant shift". In reduced power mode (limp mode) the car is in a protect mode so you can still drive somewhat. They should know this. I suspect a bad connection on a wheel sensor, TB harness, or trans related. Not hard to diagnose or repair if you get to a dealer with skilled techs that know what they are doing.

03-01-2012, 12:52 PM	#7
Chevrolet Customer Svc Drives: GM Vehicles Join Date: Jun 2010 Location: Michigan Posts: 9,327	DrSpange, you may want to try having the vehicle checked over by another dealer just to see if new eyes on the subject might shed some light and help with getting this issue resolved for you. If you don't have any other close dealers to you let me know and I'll do what I can to help with this. Jeff Morris, Chevrolet Customer Service