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Reduce engine performance

At time the engine management system reads: reduce engine performance

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This is the limp mode and is used when there are serious problems with the engine and gear box . IT is instigated by the ecm to protect the units. have the fault codes read to determine where the fault is . Check oil and coolant levels and engine temperature

Posted on Mar 26, 2014

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Posted on Jan 02, 2017

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I have an 2008 chevy impala as that sometimes give me the message "engine power reduced" "service stabilitrak" WHAT is the problem?


When there is an error with the stability ac system the computer can reduce engine power as a safety precaution. You need to have the stored codes read.

Aug 23, 2016 | Cars & Trucks

1 Answer

Had this sign limited performance pop up on my dashboard of my 2007 Saab 9-3 1.9tdi had some one look at it they plugged it in and come up with cruise control switch ? and im getting abit of turbolag


I can't see it myself even though I have no experience of the car model.

Lots of the vehicle content is Vauxhall/Opel/GM (I think) suitably modified by Saab.
It doesn't sound logical that a dodgy cruise control switch would cause reduced performance. A reduced performance condition is usually caused by something that affects tailpipe emissions or something affecting engine integrity or reliability.

I heard on the grapevine some Vauxhall models have reduced performance simply because they are overdue for some maintenance and once the service indicator has been reset they are fine again. I don't know how true this is. I know of one Vauxhall that flags up an overboost fault and cuts performance when there is an egr valve fault. The true cause could not be discovered by a generic obd scanner and it was only when it was plugged into something with some very expensive dedicated software that it became obvious.

There is no telling what the Saab boffins have done to the management programmes. There are vehicles around that go into reduced performance if the oil level or pressure is low and maybe they thought that might be a good idea.

I suggest you continue your Saab research at the local Saab dealer or on one of the specialised forums, but certainly I suggest you get the code re-read by a dedicated diagnostic machine.

May 02, 2016 | Saab Cars & Trucks

1 Answer

I have bmw 318 08 reg problem is indicating engine fault. Loss of power can u solve this problem.


Hi Anon
To find out what the problem is, you will have to get the code read as this will indicate what the fault is, when the engine management light comes on it could be 1000's of different things, so each error has its own code, you will have to take it to a garage or dealership to enable them to connect a diagnostics reader to your vehicle, reduced power is telling you , you can only drive it slowly as there is a fault and it is not 100% sure what the fault is ( car computers are not intelligent they just know something is wrong ) so it is saying reduce your speed until the fault is fixed. hope that halps

Oct 20, 2014 | BMW 318 Cars & Trucks

1 Answer

Uplander 2006 with a reading on the display that say reduced engine power what can I do to fix this problem ?


You can many times clear this error by disconnecting your battery for a few minutes...but it will not eliminate the problem it can remove the 'Reduced power' notice on your dash and improve performance briefly...best to get a scan and repair the problem...!!!!

Oct 02, 2014 | 2006 Chevrolet Uplander

1 Answer

How many ltrs of oil goes into volvo v50


Capacities are in the owners manual, As for the light read on.

When the service engine soon light (Also called the check engine light or engine management light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls you may not feel any difference in the way the engine runs, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.

Sep 13, 2012 | Cars & Trucks

1 Answer

It say engine power reduced how do I Dix it


The engine management system has detected something wrong. It is serious enough to reduce power and it has indicated so. You need to pull the codes and proceed on that information. Do this forthwith, as the condition restricts your performance.

Sep 26, 2010 | 2006 Chevrolet Impala

1 Answer

Check engine light vsc light and trac off light


VSC and TRAC lights will come on any time the check engine light does to reduce engine load. As such these lights being on may have nothing to do with the why the check engine light came on.

If the check engine light is on, a trouble code(s) has been stored in the computer that points to the problem area. The dealer should have read this code(s) to come up with what was wrong. Did the dealer give you a sheet with the trouble code number on it?

The engine may have variable valve timing, if it is not working the engine will revert back to a fail safe condition so that no damage will occur. But it will not be running a peak performance. Or it could be something with the engine timing system.

If you want to do your own checking, start calling autoparts stores to see if one will read the trouble codes for free, it is an easy job. AutoZone will read codes for free.

Hope this help.

Mar 28, 2010 | 2008 Toyota Sienna

1 Answer

Message ' Reduced engine performance'


sound like transmission slipping .fuel filter clogged.turbo stop woking.dirty fuel injectors.

Apr 16, 2009 | 2004 Volvo S60

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

2 Answers

Check engine light "reduced enging power" message?


hook it up to OBD 2 scan retrieve fault code and go from that point!

Dec 24, 2008 | 2003 Chevrolet Tahoe

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