2008 Duramax with 65K miles. Yesterday the engine light came on and a message that the engine has reduced power. It runs like it is fuel starved. No diagnosis from a mechanic. Answers possibly???

Asked by Feb 22, 2017 at 06:44 PM about the Chevrolet Silverado 2500HD

Question type: Maintenance & Repair

2008 Chev diesel with 64K miles had the engine light come on and message that engine has reduced power. Runs like it is fuel starved. Mechanic has had it all day and cannot diagnose the problem. First time I've had any trouble. I keep the filters changed. Anybody have some thoughts?

2 Answers

77,745

I don't know diesel engines but this sure sounds like a Throttle Positioning Sensor or a broken wire in its wiring harness right by the plugin for the TPS. Wires have a tendency to break inside the insulation at the plugin. This is a common problem for 2000 to 2010 Chevy V8 gas engines.

Do you have a check engine light on? Are there any codes? On my `05 there was a retrofit kit on the plug for 2 of the injectors (pass front, driver rear). that sounds like the symptom when 1 or more injectors aren't working.

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