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fairly significant
Typical Repair Cost:
No data
Average Mileage:
186,795 miles
Total Complaints:
4 complaints

Most Common Solutions:

  1. not sure (4 reports)
2003 Chevrolet Silverado 2500 engine problems

engine problem

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2003 Chevrolet Silverado 2500 Owner Comments

problem #4

Oct 152014

Silverado 2500 LS 6.0L V8

  • Automatic transmission
  • 185,000 miles


My 2003 Silverado 2500HD has been the very best vehicle I have ever owned. The only problems up to now have been normal wear and tear parts replacement. One day on the way home from work, the engine light came on, the bell rung, and the message board said "Reduced Engine Power". The engine was still running, but the throttle would not respond. I pulled over shut it off. Checked all the essentials (oil, coolant, air flow, ALL fuses) and found nothing. I started it back up after a few minutes and it was fine.

The next day, same thing. Shut if off and waited 15 min and off I went. The next time it happened I plugged up my "cheap" code reader and got "P1516, Command vs. Actual Throttle Position Correlation (TAC Module) Error". I cleared the code and everything was fine again. I looked up some forums and found everything from replace Throttle Positioning Sensor, Throttle Body clean/replace, re pin connector at throttle body, Mass Air Flow Sensor clean/replace, clean ground wires G103 and G104, reprogram PCM, or even replace the entire wiring harness and not one person who did some of these or even all of these had a permanent fix.

I cleaned my throttle body, cleaned my (spotless) mass air flow sensor, unplugged the throttle positioning sensor and got a different code. I cannot find an answer anywhere. Every shop says, replace the throttle body. I have seem tons of people report that online with zero results. It would only every occur under 40 degrees outside temp and as fast as I can clear the code, I am back to driving with no issues.

Now it happens in varying temps, but still mostly under 40 degrees outside temp. It did happen in the 60's 2-3 times over a short period. I am at a complete loss and am not ready to replace half of the engine to try to find the problem. For now, I can drive with a code reader hooked up and it takes exactly 12 sec to clear the code and I'm driving again.

- , Hayes, VA, USA

problem #3

Feb 122015

Silverado 2500 2WD 6.0L V8

  • Automatic transmission
  • 230,000 miles

The engine light would flash anytime I was above 50 mph, throwing a misfire. I plugged in my code reader, and it showed a misfire on every cylinder. Replaced the Spark Plugs and wires, nothing. Fuel Pump, Nothing. Mass Air Flow Sensor, Nothing. Air filter, nothing. Still throwing a misfire...

- , Milwaukee, WI, USA

problem #2

Jan 192016

Silverado 2500 Crewcab V8 6.0L

  • Automatic transmission
  • 240,179 miles

will be driving and reduce engine speed comes on

This problem has happened off and on for over a year, have had a local mechanic check it, but it would never act up when he checks it, wanted to do this in case anyone else has had the same problem, would appreciate any advice or help thanks

- , Vidor, TX, USA

problem #1

Feb 042010

(reported on)

Silverado 2500 LS 6.0L V8

  • Automatic transmission
  • 92,000 miles

this 2003 Chevy p.u. 6.0 4x4 has 92,000 miles you can be driving dowu the road and it will shut down to idol the readout on dash says reduced engine power what is the problem

- , Junction, KY, USA

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