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Engine light in on Reads engine power reduced

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Scanned the PCM (computer) to know what fault code is stored there; with this code number could send additional diagnostic and details.

Posted on May 25, 2011

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Posted on Jan 02, 2017

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Diesel. Reduce power lite turned on. Shut off engine and started back up - lite is off. Can it be driven?


Jerry, Drive to a good shop. So many things can cause reduced power light unfortunately. The first step would be to get the truck hooked up to a scanner/computer and have the computer scanned for trouble codes. One thing that you could try is to drain the water from the water separator that is mounted on the frame under drivers front door. If the PCM picks up on water, power is reduced until water is removed/drained. It could be an exhaust sensor that is reading faulty. Unfortunately from here its impossible to tell you exactly what the fault is because there are just so many engine sensor inputs that could cause your problem. Check the attached links, forums,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

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Dec 29, 2015 | 2008 Ford F-250 Super Duty

1 Answer

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


2003 Silverado 2500HD REDUCED ENGINE POWER - Discussion on Topix

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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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Reduced Engine Power Message Displayed on GM Vehicles

www.underhoodservice.com/tech-tip-reduced-engine-power-message-dis...
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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come back with the codes that are now showing to give us some idea as to where to look for a diagnosis.

Oct 01, 2014 | Cars & Trucks

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Reduced engine pwr light and tps code


Whats is tha fault code number detected there? Send us for aditional details.

Jul 15, 2012 | GMC Envoy Cars & Trucks

1 Answer

Need to know what the "reduced engine power' MIL


this is one of two things, first theres a problem with the engine , the way it runs its loosing power or if the wheels spin and the computer picks it up then it will reduce the power to avoid wheels from slippping, this is like when driving in the snow, now if the check engine light is coming on with this message then you have a problem and the first thing to do would be to have the codes pulled and see what codes are stored. what happens is the computer sees a problem and turns on the light and stores a code for that problem. for example there may be a code that reads po300 multiple misfires. this code would mean the computer has seen the motor misfiring and with some testing the problem can be found. there are many auot part stores that will scxan the computer for free and give you a read out with the code. if you get the codes i can help you further, have a good day.

Mar 18, 2011 | 2004 Pontiac Grand Prix

1 Answer

Check engine light is on and reads engine power is reduced


Hellow: Most likely you have a problem with the electronic throttle control. Get the codes read at auto zone or advance auto that will tell you for sure what is bringing the light on. They probably will not charge you to read the codes.

Jan 14, 2011 | 2006 Chevrolet Impala

1 Answer

Truck engine slows to idle. reduced engine power reads across instrument panel and engine light comes on. turn engine off for a few seconds and engine will run fine for a while.


This is the beginning of the bad Crank Shaft Sensor. The engine can die any time during the run, and not start until 2 hours later.
Run a diagnose with a scan tool to find out what the engine code is to confirm. Good luck.

Nov 20, 2010 | Chevrolet Silverado 2500HD Cars & Trucks

1 Answer

No power


The problem may be located at the connector on the throttle body. The terminals can be loose, broken wires inside the the plastic where you cant see them, and corroded grounds.

If you can get the check engine light to shut off, try wiggling the wiring from the connector on the throttle body from the connector out to at least 4 inches to induce a check engine light. Clean and tighten the grounds on the engine block also.

Good luck finding the problem.

Dec 12, 2009 | 2003 GMC Sierra

2 Answers

Check Engine Light & Dashboard Reads Reduced Engine Power


The reduced engine power happens because there is a problem with the electronic throttle control . Some people call it drive by wire ! The gas pedal has sensors inside , position sensors , connected electrical to the PCM - engine computer , the throttle body on the engine has a DC electric motor an also has position sensors . These are also connected to the PCM electrical . The PCM reads the position sensors which indicate how much your pressing on the gas pedal . then hopefully it opens the throttle the same amout .

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system includes the following components:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The engine control module (ECM)

Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF
- Ignore the accelerator pedal input
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.

GM Electronic Throttle Body Circuit Descriptions And Testing Tips

Tons of videos on youtube for these systems , there can be a variety problems , from wiring , worn out sensors , the DC motor , computer etc....

Jun 20, 2017 | 2007 Chevrolet Uplander

1 Answer

DISPLAY READS ENGINE POWER REDUCED


Display reads "Engine Power Reduced" and sometimes won't accelerate beyond idle. Other times it accelerates normally. We have not yet noticed a pattern.

Jul 01, 2008 | 2003 Chevrolet Suburban 1500

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