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Engine problems? severe reduction in power, continually stalls when speed is reduced,

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You need to take it in the timing is off

Posted on Feb 15, 2009

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Reduce power light on has no throttle and keeps giving throttle accuator cdes

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Reduced Engine Power Message Displayed on GM Vehicles
Dec 10, 2012 - Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles ... Model year 2008-'10 vehicles must have the engine control module (ECM) reprogrammed ... Do not drop the electronic throttle control components.

Oct 28, 2015 | Cars & Trucks

1 Answer

My 2006 Buick lacrosse reduce power light came on today--what does that mean

Reduced Engine Power
Refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 3.6L or Throttle Actuator Control (TAC) System Description in Engine Controls - 3.8L
TAC System Default Actions/Reduce Power Modes
There are 2 reduce power modes that the engine control module (ECM) can default to if an error is detected in the throttle actuator control (TAC) system. If an accelerator pedal position (APP) sensor 1 or APP sensor 2 circuit fault, throttle position (TP) sensor 2 circuit fault, or if a TP sensor 1 circuit fault is detected with some APP angle, the ECM goes into one of the 2 reduce power modes. In this mode, the engine torque is limited so that the vehicle cannot reach speeds of more than 100 km/h (60 mph). The ECM remains in this reduce power mode during the entire ignition cycle even if the fault is corrected.
If there is a condition with the throttle actuator control circuits, throttle actuator command vs actual position fault, return spring check fault, or a TP sensor 1 circuit fault, the ECM goes into the other reduce engine power mode. In this mode, the engine speed is limited to 2,500 RPM and the 3-6 fuel injectors are randomly turned OFF. At this time the Reduced Power indicator is commanded ON. The ECM remains in the reduce power mode during the entire ignition cycle even if the fault is corrected. Observe, if a TP sensor 1 or throttle actuator control circuit fault is present at the time the vehicle is at idle, with no accelerator pedal angle, the engine may stall.

Jun 21, 2015 | Cars & Trucks

1 Answer

2003 nissan frontier stalls when i slam on the brakes

Check oil level, but might be idle motor going bad. The idle motor kicks down the idle as needed as the rpm dictates. If sudden reduction in rpm occurs the idle motor normally keeps up and motor continues running at reduced idle. Unless its going out on you, then you may experience stalling when speed is suddenly reduced such as hard braking.

Mar 16, 2013 | 2003 Nissan Frontier Crew Cab

3 Answers

Se enciende la luz power reduction y el carro avanza lento "Power reduction light comes on and the CAR drives slowly" (lacks normal power)

I have problems with power reduction and review it with the computer but sheds no fault code, and I made several changes but it is not

Jun 02, 2012 | 2001 Isuzu Rodeo

1 Answer

In my 2007 tahoe power reduction message comes on what could be the problem

Your Tahoe goes into "Power Reduction Mode" to keep you from continuing to operate the vehicle with an OBVIOUS problem and destroying high-dollar parts like catalytic converters, cylinder heads, etc.. Yeah, the old days of simply ignoring Check Engine lights are over.... The manufacturers have made it so the engine will go into reduced power mode and FORCE you into properly maintaining your vehicle.

(Not saying that you don't maintain your vehicle...Just pointing out that you can thank all of those people that continuously run around with warning lights SCREAMING all over their dash for the wonderful little "Reduced Power Mode" feature.)

As for what could be actually causing thie problem? Well, just let me say that the last time I counted, there were over 600 "generic" OBD fault codes available for most cars (80% of which will turn the Check Engine light on long before reduced power mode takes place), and several hundred more "vehicle specific" fault codes that have not yet made the generic code list.

So, to put it simply, you will have to scan your computer network and gather all the fault codes and perform fault code diagnostics to determine the actual cause of your problem.

Jan 10, 2012 | 2004 Chevrolet Tahoe

1 Answer

Loss of power check engine light

is the check engine light on ! if so it may be a clogged up convertor. here is the symtoms, A clogged catalytic converter reduces the flow of a vehicle's exhaust by creating a constricted and/or blocked exhaust channel, which engine exhaust gases flow through on their way out of a vehicle's tail pipe. By reducing the flow of exiting engine exhaust gases, a condition that creates an increase in engine exhaust back pressure (thereby reducing engine efficiency), a clogged catalytic converter results in a small reduction in engine horsepower. A clogged catalytic converter causes a reduction in vehicle gas mileage.
Fumes leaving exhaust is sulfurous as if it is coming from a rotten-egg is one of the unmistakable clogged catalytic converter symptoms. good-day !

Nov 09, 2011 | Cars & Trucks

1 Answer

I have a 2006 Chev impala. Engine power reduced. I have had the accelerator pedal changed, the housing for it changed, and replaced the computer and paid to have it "relearned," Still having...

There are several causes for this, sadly in your case none of them were addressed at all.

In any case, changing the accelerator pedal wouldn't help with that particular problem unless it was
broken in such a way as to prevent it from being pushed down.

A reduction in engine power is part of the engines' computer (PCM) program to prevent damage. The root cause of the power reduction is what needs to be serviced. That is why even after a new computer you still have the problem.
On a GM vehicle with the factory programmed PCM, reduction in engine power *if that really is what your vehicle is doing* is sometimes referred to as "abuse mode." If at any time there were any incidents of doing a full throttle start, this mode and thus it's programmed reduction in engine power would be enabled.
Another cause of reduction in power does not have to pertain to a PCM program but rather the engines' running condition. Bad spark plugs, plug wiring, fuel system problems, gross exhaust leaks or engine air intake problems will cause loss of power.

I thought it might also be of service to you to remind you to carefully review your warranty, as the engine computer (PCM) is part of the emissions system and thus covered 100% far beyond the powertrain warranty required by EPA law.

Jan 12, 2011 | 2006 Chevrolet Impala

4 Answers

Engine power has been reduced

I had the same problem. Took it to a Chevy dealer to be checked out. It turned out to be a wire that was loose that was connected to the throttle position sensor. They had just had three other 06 Impala's come in for the same problem.

Jan 12, 2009 | 2006 Chevrolet Impala

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