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Information panel shows "reduced power" idles

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Fuel quality
Fuel filter
fuel pump.
More than likely one or more of the above...
Best regards
Ck

Posted on Mar 14, 2011

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Posted on Jan 02, 2017

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1 Answer

Throdlebody and gas peddle out of sink won,t go faster than 30


If you would like help we would need the DTC - diagnostic trouble code .Is their a Reduced Engine Power Mode message showing on the instrument cluster ?
Reduced Engine Power Mode
When the PCM detects a problem with the throttle actuator control (TAC) system the PCM enters one of the following Reduced Engine Power Modes:
• Acceleration Limiting--The control module will continue to use the accelerator pedal for throttle control, however the vehicle acceleration is limited.
• Limited Throttle Mode--The control module will continue to use the accelerator pedal for throttle control, however the maximum throttle opening is limited.
• Throttle Default Mode--The control module will turn off the throttle actuator.
• Forced Idle Mode--The control module will perform the following actions:
- Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
- Ignore accelerator pedal input.
• Engine Shutdown Mode--The control module will disable fuel and de-energize the throttle actuator.
IF you do not know this your best bet would be to take to a qualified repair shop .
DTC P0506
DTC P0507
The throttle actuator control (TAC) motor is controlled by the powertrain control module (PCM). The DC motor located in the throttle body drives the throttle plate. In order to decrease idle speed, the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this DTC sets.

Jan 05, 2017 | Cars & Trucks

1 Answer

Why do I have no throttle response on my 08 Saturn aura


Your vehicle has electronic throttle control , controlled by the engine computer .Do you have any messages come up on the DIC - driver information center Reduced Engine Power
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode.
Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF.
- Ignore the accelerator pedal input. Have it check for DTC'S - diagnostic trouble codes

Feb 16, 2016 | Saturn Cars & Trucks

2 Answers

Starts and idles, no accelerator response.


Your Denali has Throttle Actuator Control (TAC) System - Electronic throttle control ! Are there any messages on the driver information center ? Reduced engine power ?
Reduced Engine Power Mode When the PCM detects a condition with the TAC system the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.


?€¢
Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.


?€¢
Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.


?€¢
Forced idle mode--The control module will perform the following actions:


-
Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.


-
Ignore accelerator pedal input.


?€¢
Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.


You need to have it checked for DTC'S - diagnostic trouble codes , probably a accelerator pedal position (APP) sensor or TPS - throttle position sensor !

Jun 01, 2015 | 2003 GMC Yukon Denali

1 Answer

Loss of power on dash and operates only at idle no matter how far i press on the gas pedal


Throttle Actuator Control (TAC) System Description
You have APP- accelerator pedal position sensors or one of the Throttle position sensors is going bad ! In the (TAC) system ! This is drive by wire or electronic throttle control . If you take it to the dealer or a ASE certified repair shop they can check the DTC'S - diagnostic trouble codes ! This is nothing for a DIYer to mess with ! This system can set 7 different DTC'S

Reduced Engine Power Mode When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.

?€¢
Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.

?€¢
Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.

?€¢
Forced idle mode--The control module will perform the following actions:

-
Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.

-
Ignore accelerator pedal input.

?€¢
Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.


Drive by Wire Function and Diagnostics by Wells

May 14, 2015 | 2004 Chevrolet Silverado 2500 Crew Cab

1 Answer

1992 pajero auto temp light stuck on when motor wasn't running long when accelerating vehicle stopped then hard to start now won't start at all,


Sir if the starter is not even turning im sorry to inform your engine might be broken. Lack of oil could be the reason. I d reccomend to send to a mechanic shop inmediately.

Jul 12, 2014 | 1995 Mitsubishi Montero

1 Answer

Engine lacks power when accelerating. Idle ok.


unfortunately when you leave for long period of time fuel in carbs turn to a gel you may have to clean the float chambers out and put fresh fuel also look for signs of rust deposits from tank

Apr 21, 2013 | Cars & Trucks

1 Answer

2006 Saturn vue, 4 cylinder. Ran out of gas, couple gallons put in, ran fine. Went to gas station filled up full. Driving home, noticed my reduced power indicator flashed a few times on then off. Once...


reduced power , electronic throttle control problem . 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.

May 04, 2017 | 2006 Saturn Vue

1 Answer

1995 Chev Silverado 2500 5.7 ... was running fine, then began missing while idling. A few minutes later, would not shift into overdrive for lack of rpm's and accelerated slowly. Was towing a trailer. ...


I stopped to assist a gas powered Winnebago stuck on the highway a while back. The engine would run but not produce much power or rpm's.

The problem turned out to be a plugged muffler which seriously reduced the air flow to the intake system and as a result the power and ability of the engine to rpm's or power.

As modern day vehicle engines are computer controlled there could be systems that are not functioning properly...which should log a code and activate a warning light on your dash board. ODBII diagnostics is always the first step to take when trying to isolate a fault.

Jul 21, 2017 | 1995 Chevrolet Silverado 2500

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