My 2008 Chevrolet Express 1500 is indicating Engine Power Reduced and Service TPS System, can a faulty tps system and or a really bad catalytic converter be the culprit?


Asked by Jan 30, 2016 at 05:32 AM about the 2008 Chevrolet Express Cargo 1500

Question type: Maintenance & Repair

I should have replace it at least a year ago, the catalytic converter has been bad, can it or the service tps system, or needing an oil change bad, (oil shows 0 %  for being effective and I know that I am not using the correct term for oil life), be the cause for my 2008 Chevrolet Express going into Engine Power Reduced mode? Also, when I am on the highway and I have gotten past an incline I can get it up to about 50 mph, but once I slow down or stop it has really low power taking off and won't pull any hill or slight incline. When it is idling, it is running and sounding like a tractor, vibrating and engine seems to rattle the whole front end. If I give it a little gas, it quite down a little and doesn't vibrate as much. I was told by someone that one of the sensors in the Catalytic Converter, or in the emission system has to do with the throttle, (throttle position sensor?), and because it is bad, the system doesn't know how much gas to give or how fast the car may be going because of not knowing how much the throttle is open then the engine power is reduced as a safety.

2 Answers


Something like that. The root of the problem would be the catalytic converter being plugged up, and the 02 sensor reading out of range, so the computer is just trying to adjust air fuel mixture the best it can, causing either a rich or lean condition. I would start by replacing the catalytic converter, getting an oil change, oil light would need to be reset, and clear all the codes. Then drive it to see if the check engine light comes back on, if it does, then you will have a more true sense of any more problems. The code or codes would tell the story at this time.

Best Answer

I believe that would definitely be the best thing to do and it is where we will start.

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