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Reduce engine reduction light

Light came on when startiung the car and then went off.

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The vtm4 light went on( I think by itself ) will not disengage the malfunction light is also on now air & heat works one day then dont work for a day or two how do I unlock the switch ?


Honda Guy had this to say;
When operating normally your VTM-4 light means the vehicle is in traction control mode. HOWEVER, if the light just came on when you were driving it is an indication that you have a problem with the engine that is causing the VTM system to think the vehicle is in traction control mode because of a loss of engine power or misfire.

Here's how that happens: on a Honda, the way the vehicle restores traction is by reducing engine power to the point where the wheels don't spin as fast and thereby restores traction to a slipping wheel (slipping wheels spin faster than the other wheels). Conversely, when there is a reduction in engine power that is abnormal, the VTM system "thinks" that the engine power is being reduced to restore traction and it triggers the light.

In almost all cases, the light is being triggered by an idle speed control valve malfunction or in some cases by an EGR valve malfunction. It may or may not turn on the check engine light. This problem was fairly common on Pilots in 2004 and 2005 but certainly isn't limited to just those years.

Take the car to a Honda dealer or to a mechanic and have them check for stored codes in your powertrain control module. I think you're going to find that there is a code for an idle speed control valve malfunction or an EGR valve malfunction. The idle speed control valve is warranted for 8 years or 80,000 miles; the EGR for 3 years or 50,000 miles. Your Pilot is probably still in warranty and if so the repairs would be made at no charge

hope that helps
https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=video&cd=1&cad=rja&uact=8&ved=0ahUKEwj6m4uf2K7KAhXCXD4KHb_QB9YQtwIIJDAA&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D6ly6_UdyRPA&usg=AFQjCNHHIpyY0Issg7_9VC0vUY3AckF55A&bvm=bv.112064104,d.cWw

Jan 16, 2016 | Cars & Trucks

1 Answer

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


2003 Silverado 2500HD REDUCED ENGINE POWER - Discussion on Topix

www.topix.com > Top Stories
Dec 28, 2009 - 20 posts - ‎12 authors I have replaced the throttle body, had the wires re-connected and .... The gauges all went wild and reduced engine power displayed on the dash. I looked it .... The truck just went to idle for no reason and it keeps happening. 2003 Chevy Trailblazer-CHECK ENGINE LIGHT AND ...
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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.

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2002 gmc envoy problems


Your starter switch is faulty

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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

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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.

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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 !



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1 Answer

Check engine light on and reduced engine power i didnt warm my car up could that be the problem once i got home and cut the motor off and restated it the power came back and reduced engine light went off...


Take your TB to Autozone or a parts store that offers a free check engine light check. All they do is tell you what code your check engine light is throwing. Get this code, and we can help from there.

Dec 14, 2010 | 2002 Chevrolet TrailBlazer

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Car is in "limp home" - reduced engine power mode


check and see if the traction control light, abs light are on the dash. those things can put your car in a reduction mode, because the computer thinks you are on a skid

Mar 24, 2010 | 2006 Chevrolet Malibu

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Reduce engine power 2007 chevy uplander


Sopunds like the computer has gone into a limp mode. You need to take it in for a professional diagnosis.

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Code drive 5 . My 2004 trailblazer posted a code "drive 5". It showed the "reduced engine poweer" light, and would not respond to the accelerator pedal. I had been driving in slow traffic. I pulled over,...


Thottle body sensor, accelerator pedal sensor, restricted air flow...will all trigger this fault light. Go to your local Autozone, they will run an OBD scan for free, and explain the fault codes to you so the correct repairs can be made.
Good luck...i hope this helps, please rate me a fixya.

Jul 22, 2009 | 2004 Chevrolet TrailBlazer

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