Question about 2004 Chevrolet Silverado 1500 Crew Cab

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2004 chev silverado always has engine light on and reduced engine speed. had in shop and checked throttle body cant find any problems. truck will eventually stall upon stopping.what else can i check out? this is gettin very frustrating.

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  • Germay May 04, 2013

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It sounds like its the engine speed censor, playing up
try looking at the mass air flow censor as well it is one of them thats doing this,,you could hook it up and read the fult codes that way it should take you right to it,

Posted on Nov 16, 2009

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Posted on Jan 02, 2017

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Reduced engine power


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Drive by Wire Function and diagnostics by Wells

Reduced Engine Power Mode
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The control module will perform the following actions:
- Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
- Ignore accelerator pedal input.
• Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.

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Common problem with wiring to tac unit wires break inside sheathing a couple inches away from your throttle body. Or your throttle body is dirty.

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Thanks for choosing Fixya and welcome to the site. It sounds like you have low compression in the engine. First, let me ask this. Is your check engine light on?

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