Reduced Engine Power
#1
Staging Lane
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Reduced Engine Power
Here is a ? for u guys maybe u all can help me out. I have a 04 sierra with the 5.3. It has a tune,cold air intake, tb bypass,and headers as mods...well here is what is going on. When i start the truck sometimes it says REDUCED ENGINE POWER. After I turn it off and on a couple of times it works fine. It also does this when I floor it. what could it be? They told me that one of the battery wires was loose and that was causing it to do that but I tighten both of em and it is still doing that.
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my bullydog programmer does it every time i take it off and put it back on and when it does it throws a engine code like c107 or sumthin, but i can clear the dtc codes on my programmer by bullydog so i just do that and its fine after that. but idk it prolly is your tune tho.
#7
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Throttle Actuator Control System(this includes the pedal position sensors, TAC Module, TB, wiring and TAC to PCM communications) faults are the prime suspect, particularly if REP is triggered before the engine even starts. i.e. just turn the key to the RUN position and see if it goes into REP mode. Turning the key to the OFF position for at least 15 seconds will reset/clear REP if the fault is no longer present.
There is a TSB for an internal break in the yellow wire within the first 4 inches from the throttle body: "SES light and reduced engine power with a DTC P1516. DTCS P0120, P0220, P1514, P1515, P1518 and P2135 may also be present."
Other faults in the system will set other DTCs. e.g. P2135 if there is a disagreement between the TPS1 and TPS2 signals.
There is a TSB for an internal break in the yellow wire within the first 4 inches from the throttle body: "SES light and reduced engine power with a DTC P1516. DTCS P0120, P0220, P1514, P1515, P1518 and P2135 may also be present."
Other faults in the system will set other DTCs. e.g. P2135 if there is a disagreement between the TPS1 and TPS2 signals.
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well guys had my truck check for the tune and it is not that but it is still doing this once in a while. when i turn it to RUN it does not give out the REP code only when i turn it on???
#9
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Originally Posted by elrojo27
well guys had my truck check for the tune and it is not that but it is still doing this once in a while. when i turn it to RUN it does not give out the REP code only when i turn it on???
#10
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Originally Posted by elrojo27
Here is a ? for u guys maybe u all can help me out. I have a 04 sierra with the 5.3. It has a tune,cold air intake, tb bypass,and headers as mods...well here is what is going on. When i start the truck sometimes it says REDUCED ENGINE POWER. After I turn it off and on a couple of times it works fine. It also does this when I floor it. what could it be? They told me that one of the battery wires was loose and that was causing it to do that but I tighten both of em and it is still doing that.