Engine reduce power
Thread Starter
Intermediate
Joined: Mar 2022
Posts: 43
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Engine reduce power
I have a c6 Vette 2005. My problem is that the "Traction control light" starts to light up and it appears on the display "Servic Active Handling system" and also "Engine reduve power" I stop the car in a suitable place, disconnect the battery and wait a while. Then reconnect the battery and everything works great again. After 50 to 100 miles it's back again "engine reduce power" just disconnect the battery and wait a while, and so on..... what should I do???
Thread Starter
Intermediate
Joined: Mar 2022
Posts: 43
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OK, I have check all wires from Spark plugs and to Coils and can´t find any problems.
I Also checked Steering Wheel position sensor and its fits quite loosely. So I ordered today a new clip GM 19179794
I understand I must buy something to check codes with, to get to see what modules is having problems. I do that and come back later!
I Also checked Steering Wheel position sensor and its fits quite loosely. So I ordered today a new clip GM 19179794
I understand I must buy something to check codes with, to get to see what modules is having problems. I do that and come back later!
Safety Car
Joined: Sep 2005
Posts: 4,212
Likes: 643
From: Orange County Ca
A lot of parts stores will check codes for you for free, or rent you a code reader.
I had a simular problem and it turned out to be the gas pedal. Gas pedal??? Yea, go figure.
All the new electrical stuff is really great, when it works.
I had a simular problem and it turned out to be the gas pedal. Gas pedal??? Yea, go figure.
All the new electrical stuff is really great, when it works.
Race Director
Joined: Dec 2013
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Yep, since most of the time, is either the accelerator pedal sensors, or the TB sensors that will cause the reduced power problems. Hence both have a pair of sensor that work oppiste to each other in each unit, and if the reading from one of the sensors in the unit is not reverse matching what the other is doing, you get the problem.
If you have the talent, both of these can be pulled apart to clean the sensors to solve the problem, while not having to buy new units. Hence just swiper arms off a restat pad, and its the pad that get dirty or the arm that needs to be tweaked to solve the problem.
As for accelerator, entire assembly is less than $100, while the TB can be a lot more spendy instead.
And again, before you start swapping parts, pull the codes to see what module is having the problem in the first place.
If you have the talent, both of these can be pulled apart to clean the sensors to solve the problem, while not having to buy new units. Hence just swiper arms off a restat pad, and its the pad that get dirty or the arm that needs to be tweaked to solve the problem.
As for accelerator, entire assembly is less than $100, while the TB can be a lot more spendy instead.
And again, before you start swapping parts, pull the codes to see what module is having the problem in the first place.
Thread Starter
Intermediate
Joined: Mar 2022
Posts: 43
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Not so easy to pull the codes, When active handling and reduce engine power comes up, I´m a long way from home... So I must stop the car and take away - wire from the Battery and wait a few minutes. Warning and codes are gone and I can drive on again to next time Reduce power comes back. When I come home no codes left. I have cleaned the contact to Accelerator pedal sensor and even to TB sensor. OK I take them off and clean them inside and hope that solve the problems. Otherwise I start with buy a new Accelerator pedal.
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Moderator, Tech Contributor
Joined: Sep 2013
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From: Cape Coral, Florida
I have a c6 Vette 2005. My problem is that the "Traction control light" starts to light up and it appears on the display "Servic Active Handling system" and also "Engine reduve power" I stop the car in a suitable place, disconnect the battery and wait a while. Then reconnect the battery and everything works great again. After 50 to 100 miles it's back again "engine reduce power" just disconnect the battery and wait a while, and so on..... what should I do???
Thread Starter
Intermediate
Joined: Mar 2022
Posts: 43
Likes: 3
I have Bought an Canbus capable OBDII diagnostic a cheap one. I drive to a Big Power Meet tomorrow. I take OBD2 with me. Maybe Reduce engine power comes up and AH. I check it today but no codes. I´m redy for it!
Race Director
Joined: Dec 2013
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Not so easy to pull the codes, When active handling and reduce engine power comes up, I´m a long way from home... So I must stop the car and take away - wire from the Battery and wait a few minutes. Warning and codes are gone and I can drive on again to next time Reduce power comes back. When I come home no codes left. I have cleaned the contact to Accelerator pedal sensor and even to TB sensor. OK I take them off and clean them inside and hope that solve the problems. Otherwise I start with buy a new Accelerator pedal.
Yes, and no. Tech II will pull not only the deepest of codes before they set a error light off, but the stored codes that the BCM will not flush out of the system for many restarts, since the BCM checks all the modules every start up.
So the problem is, you don't have a code reader that is able to pull the stored history codes.
You don't list your location, but if you either do, or check around in your area, someone local may have a Tech II clone to pull the history codes to figure out which module is causing the problem, and what part of the sensor is the problem as well.
Thread Starter
Intermediate
Joined: Mar 2022
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Not so easy to find someone with Tech 2 nearby. I live outside Halmstad in Sweden. The easiest is to buy a GMtech 2. We were at "Power meet Hassleholm" last Saturday and that trip was 143 miles without any problems. Sometimes it works without problems.
Race Director
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If your going to wrench on the car yourself, really need a tech II clone to start with, and the VX GM Nano using a laptop is about the least expensive and best option out there.
It can run Tech2win for the C6 and older cars, as well as GDS2 for the later cars as well. Plus, it comes with cracked version of both from the start, which you run for free. Throw in that your C6 is pre-2009, which means that you can run cracked TIS2000 with it for free too, if you do ever need to replace a module in the car and need to flash it in.
Check amazon in your area, but in the USA, it goes for $129, and again, all the software you need for it free as well.
It can run Tech2win for the C6 and older cars, as well as GDS2 for the later cars as well. Plus, it comes with cracked version of both from the start, which you run for free. Throw in that your C6 is pre-2009, which means that you can run cracked TIS2000 with it for free too, if you do ever need to replace a module in the car and need to flash it in.
Check amazon in your area, but in the USA, it goes for $129, and again, all the software you need for it free as well.
Thread Starter
Intermediate
Joined: Mar 2022
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I have now got my Clon GMtech2 and I can see I have had a lot of codes in history. I have did a lot with my car new spark plug, coil, Air sensor, clean all electrical contacts, new battery etc etc.
So I take away all codes and use the car as normal tills Engine Reduce power comes up, Then I go back to Tech2 and can maybe find the code who give me Reduce engine power.
So I take away all codes and use the car as normal tills Engine Reduce power comes up, Then I go back to Tech2 and can maybe find the code who give me Reduce engine power.
Race Director
Joined: Dec 2013
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Normal to have a ton of codes if the car was tried to be started with a low/dead battery.
So yes, clean the codes to start with, and the see what comes back that is causing the limp mode. With luck, it just the gas pedal sensor, and new assembly is only $100, or can just douche the hell out the sensor to get spray electrical contact cleaner into the sensor to work the pedal by hand a few times to clean the swiper pads in the sensor to solve the problem.
As for TB, it also has two swiper sensors in it as well, but a bigger ordeal pulling A TB apart to clean its pair of swiper sensors parts.
As for why GM did not make both the gas pedal and the TB sensors external units to just replace them as needed like most of the other cars they make (instead of having o replace the entire assembly), still don't have a clue. Simply, when the car is going into limp mode, its one of these two 99% of the time that is faulting to cause the problem.
So yes, clean the codes to start with, and the see what comes back that is causing the limp mode. With luck, it just the gas pedal sensor, and new assembly is only $100, or can just douche the hell out the sensor to get spray electrical contact cleaner into the sensor to work the pedal by hand a few times to clean the swiper pads in the sensor to solve the problem.
As for TB, it also has two swiper sensors in it as well, but a bigger ordeal pulling A TB apart to clean its pair of swiper sensors parts.
As for why GM did not make both the gas pedal and the TB sensors external units to just replace them as needed like most of the other cars they make (instead of having o replace the entire assembly), still don't have a clue. Simply, when the car is going into limp mode, its one of these two 99% of the time that is faulting to cause the problem.
Thread Starter
Intermediate
Joined: Mar 2022
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Hi! I have now drive my Vette Many miles after I delete all old codes and yesterday I get Same problems again Engine reduce power An my car Stopped. I take away Negative pole from battery and waiting 5 minuts. Then I started and everything works fine and no problem to get home. Today I take my new GMtech2 and check the codes.
EBCM U2106 Lost com. with TCS
Body control modul U2100 Canbus com. Symptom 00
Body control modula U1096 Lost com. with Instrument panel cluster
Suplemental inflatable restraint U1064 lost com. with body control module
What can I do are my TCS broken and needs to be replaced.
or what can I do?
/Goran
EBCM U2106 Lost com. with TCS
Body control modul U2100 Canbus com. Symptom 00
Body control modula U1096 Lost com. with Instrument panel cluster
Suplemental inflatable restraint U1064 lost com. with body control module
What can I do are my TCS broken and needs to be replaced.
or what can I do?
/Goran
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,410
Likes: 3,964
From: Cape Coral, Florida
When you say your car "stopped" do you mean it shut off ???...you have a lot of "U" or communication codes...I see you have a Tech 2 so see if you establish any communication with the car or does the scan tool keep saying "waiting for data"...will the car even start now ??...if you have a DVOM and can look at voltage and resistance we can make some checks of the CAN bus system and the Class 2 serial data system...the U2106 is lost comm with TCM...your TCM sits above the ECM in the wheel well behind the right front tire...many comm issues involve modules located outside of the car since they are more exposed to the elements...at least the ones I've seen anyway...if this possible communication issue is intermittent DVOM is not the best tooling for this...I use a labscope because I can see any comm issues the second they pop up.
Last edited by C5 Diag; Aug 18, 2023 at 10:59 AM.
