I assume it has a diesel. Possibly the regeneration of the exhaust isn't working. It is going into the "limp home mode". Some name huh.
By having the problem repaired that caused the light to come on and speed to be reduced.
The reduced engine power light means that there is a problem with the battery or power system. It almost always means a battery connection issue.
You need to rent / purchase an OBD II code reader to check & reset the check engine light.
The Check Engine light is on because there is a problem with the emissions system. Once you have the problem repaired the light will go off.
The engine power reduced light will turn on in Chevrolet HHR when a failure is detected in one of the sensors or engine components. An OBD II code reader can determine the cause and help with making repairs.
Have vehicle scanned to have stored codes erased
The "Reduced Engine" Warning Light alerts drivers when/if there is a serious problem with the transmission and/or one or more of the engine system components.
There are pages and pages and items that can cause a check engine light. You need to have it checked for codes with a scan tool. After repair light can be shut off with scan tool.
I have a 2006 Saturn ion. The reduced engine power light came on and the car still runs but will not accelerate and only goes 30mph
gmc serra engine power reduce,can't drive no power
Get the computer scanned to see what the problem is.
When my Reduced Engine Power Light came on in my 2004 Envoy it ended up being the entire pedal assembly and the electronics that control it. If I remember correctly it ended up setting me back around $500.00. Hope this helps!!