Question about 2003 GMC Sierra 1500

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Dash light says--Reduced Engine Power - 2003 GMC Sierra 1500

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You need to have an OBII scan(fault scan) - to identify what sensor triggered computer (light) Reduced Engine Power = rig is in "Limp" mode. So you can drive it to get to repair shop.

Posted on Mar 12, 2011

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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
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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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Engine light on and dash warning says---reduce engine power. and it is reduced. what's wrong??


Many things cause reduced engine power. Could be engine sensors/parts or could be transmission sensors/parts. You need to have the codes read. Repost with them and we can help you with your problem. Year, make, and model also helps..

Jan 14, 2015 | Cars & Trucks

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Reduced Engine Power message comes on along with the engine light. It does this off and on. Sometimes it runs good and sometimes it barely runs at all. What causes this?


need to have vehicle scanned the trouble codes will be stored in the computer most auto stores offer thi service for free check ur local area there are a few hundred different codes or problems that can cause ur problems and being interment can also be an electrical connection/harness problem

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Engine power is reduced keeps showing on the dash screen, as does service traction control. the car is running rough and has no power when this occurs.


how do you fix the "reduced engine power" light on the dash bard of a 07 Chevy Impala LTZ and "Service Traction Control"?

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Service Stabilitrak-Reduced Engine Power


the engine light is a generic fault indicator in your car to point out something is not quite right with the engine, having a loss of power as well is also known in some areas as Limp Mode or Safety Mode. it means the car is restricting the power it gives to ensure no damage it done to the engine.

the only certain way to find out what is wrong is to take it to a garage that has diagnostics equipment that can read the fault codes from the vechicles ECU (the fault codes will be the reason the light on the dash has come on as its reporting a fault somewhere)..

your mechanic should be able to tell you what is wrong with the engine from that and give you a more accurate cost at fixing it.

Dec 29, 2009 | 2007 Chevrolet Equinox LS New Cars

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2004 chevy silverado


The above descriptions of the connector are very good. I washed the engine compartment yesterday, and immediately started getting the reduced enginer power code on the CIC, not performance. After reading several posts, I checked the connector on my 2003 2500HD, and found that the connector was not seated well and had gotten water in it. I cleared the water and the reconnected. The cables running from the fuse box to the connector are so short, the connector is in a bind and is pulled off-center. That is why the connector wasn't seated properly. The code went away, and the performance returned. By the way, be sure to do this after pulling the negative cable on your battery.

Oct 18, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab

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