Question about 2006 Chevrolet Silverado 2500HD 2WD

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Check engine light, low engine power

Have 3 check engine codes P1258, P0449, P1516. All due to low engine power. Truck will be riding fine then it says low engine power and the gas can't be pressed. Shut the truck down it will start right back up but doesn't last long till it happens again. I let the truck sit for a few days and the check engine light will go off and the truck will run good for a few days but then it starts all over again. Any help is much appreciated!!! Just lost job and need to try and find work doesn't help with truck not running properly!!!

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  • Chevrolet Master
  • 11,752 Answers

You get a reduced power message ? Your vehicle has electronic throttle control or also known as drive by wire . Your gas pedal is electrically hooked to the PCM - engine computer . Has two position sensors inside as does the throttle body on the engine . Over time these position sensors wear an cause improper signals to the computer an the computer will put the vehicle into a limp mode . Most cases it will drive but only at about 20 mph . There are videos on youtube showing how this works , how to diagnose etc....
This P0449 is something different , has to do with the Evap. emissions .
DTC P0449 Evaporative Emission (EVAP) vent Solenoid Control Circuit . Planty of videos on youtube for GM trucks on this problem .
DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
The predicted throttle position (TP) is compared to the actual throttle position. The two values should be within a calibrated range of each other. Both the powertrain control module (PCM) and the throttle actuator control (TAC) module redundantly monitor the predicted and actual throttle position. DTC P1516 sets if the PCM detects an out of range condition between the predicted and the actual throttle position.
Look's like you have three different problems , Thought p1516 an p1258 were going to point to same electronic throttle problem .

P1258
Engine Coolant Overtemperature - Protection Mode Active
PCM
DTC P1258

Circuit Description
The powertrain control module (PCM) uses the ECT sensor to monitor the engine for an over temperature condition. This condition occurs when the coolant temperature is above 132°C (270°F). When an over temperature condition is present, DTC P1258 will set. The PCM will disable two groups of four cylinders by turning OFF the fuel injectors. By switching between the 2 groups of cylinders, the PCM is able to reduce the temperature of the coolant.

Check the engine cooling fans for proper operation.
Are the engine cooling fans operative? Have you ever had the thermostat changed ? Is the coolant full ?

Check out youtube videos ! Just type your codes into the search bar .

Posted on May 02, 2017

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Posted on Jan 02, 2017

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keemo68
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SOURCE: Vehicle shuts off and will not start back up right away. P0601

what that means is your engine goes into protection mode and shut's off this is mostlikel;y do due to low coolant level or low oil level/pressure. have this checked by a qualified tech. diagnostic equipment must be used to clear the code after the problem is solved in order for your vehicle to run properly

Posted on Apr 21, 2009

Molson02536
  • 3854 Answers

SOURCE: I have an 1989 chevy

It sounds like you may have a bad fuel pressure regulator. The fuel pressure regulator is in the throttle body housing and the throttle body in your truck works best at 13psi to 15psi, Any other setting will cause problems. Check the vacuum hose to the fuel pressure regulator at the throttle body and check the fuel pressure at the shredder valve. The way the throttle body works is for the first 75% of the throttle, the ecm uses the signal form the O2 sensors to control the air fuel ratio and tries to keep it to 14.7:1 but at full throttle it by pass the O2 sensor signal and runs the engine richer and advances the timing so you can drive with wings like red bull. The Map sensor then takes over to promote the engine to run richer so you don't run lean and detonation occurs. If there is a problem with your throttle body position sensor, map sensor. and fuel pressure regulator, then at WOT (skinny peddle down) you may be running to rich. The other thing to is if your fuel pressure drops at WOT you'll get a lean condition and then you'll have detonation ( Knocking) and the timing will be turned down to keep detonation from occurring again and that may be the cause if your check engine light too. First and easiest thing to do is change the fuel filter and add fuel injector cleaner to you gas tank, buy a throttle body cleaner and clean your throttle body to make sure you don't have varnish build up around the throttle body, just follow the instruction on the can. Throttle body cleaner not carb cleaner. Start with that and i hope we don't have to do any more to get your truck running like a rocket. Good luck and keep me posted. Be glad to help. 

Posted on Jun 23, 2009

  • 1 Answer

SOURCE: PO300 code on 2004 Chevy 2500hd

Hi Frank, Give me a call, 866-718-1234 ext 158.

Posted on Jul 13, 2009

  • 7353 Answers

SOURCE: Truck check engine light flashing on and off,

Flashing is BAD, that means its running/ misfiring enough to damage the catalytic converter. Have it checked by a repair shop ASAP.

Posted on Jan 23, 2010

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