Chevy Truck Forum | Silverado Sierra GMC Truck Forums. 2004 Chevy Silverado 2500HD 6.0L Gas. Thanks in advance! Subject:SES Light and Reduced Engine Power DTC P0120 P0220 P1516 P2135 Models:2004-2006 Buick Rainer 2005-2006 Cadillac CTS-V 2003-2006 Cadillac Escalade 2003-2006 Chevrolet Avalanche, Corvette, Express, Monte Carlo, Silverado, SSR, Suburban, Tahoe, Trailblazer 2003-2006 GMC Envoy, Savana, Sierra, Yukon 2003-2006 Hummer H2 2005-2006 … 3. I was on the highway driving and pulled off into a mall and my check engine light came on and the truck started missfiring and sputtering like it … Chevrolet Silverado Misfire Reduced Power and Catalytic Converter. That means that basic repairs and any freak mechanical errors will be covered for up to five years at low or minimal cost to you. Code reader shows po641 which is a 5 volt circuit reference. I shut it off and restart... "reduced engine power" appeared on dash - 2004 Chevrolet Silverado 2500 HD I have read around the net, and this is what I have done so far: Replaced APP, Ohmed out the wiring between the TAC and the APP then the TAC and the TPS. However it’s happened about every 2nd or 3rd day for about 2 weeks now. If you are concerned about mechanical issues with the new 2016 Chevy Silverado, remember that the complimentary Chevrolet Complete Care program comes standard with every new Chevy. 11 Silverado 1500, been throwing a code where it cuts off power, and traction control and stabilitrak are shut off. check engine light stays on and this morning "reduced engine power" flashed along my dash and the gas pedal wouldnt work. The P1516 engine code refers to the drive-by-wire system on your Chevrolet Silverado 1500. When a component on the system fails, the truck is forced to drive in reduced engine power mode. I can shut off engine and let sit for 30 seconds and re fire and keep going with 0 issue. Aug 23 2014, 6:22pm. Watch the following two videos that show how a damaged wire caused a Reduced Engine Power message to appear in a 2007 Chevy HD. Since owning the truck I have had little to no problems until about three weeks back. Replaced the throttle body entirely. Misfire, Reduced Engine Power. Replaced the wiring harness to the throttle body. Misfire, Reduced Engine Power. Subject: SES Light and Reduced Engine Power DTC P0120 P0220 P1516 P2135 Models: 2004-2006 Buick Rainer 2005-2006 Cadillac CTS-V 2003-2006 Cadillac Escalade 2003-2006 Chevrolet Avalanche, Corvette, Express, Monte Carlo, Silverado, SSR, Suburban, Tahoe, Trailblazer 2003-2006 GMC Envoy, Savana, Sierra, Yukon 2003-2006 Hummer H2 2005-2006 … Our truck is a 2004 Sierra 2500hd and for the past year, the reduced engine power message with the check engine light has been coming on and causing issues. I went to drive truck from auction house and thought I would drive it home but I made it out the gate and traveled about 3 miles limping with no power at 5-10 mph. I have purchased a 2004 2500 crew cab 6.0 with the ally trans. I purchased this vehicle used from auction with 248K and it started tripping this u0107 code from the get go. Some Escalade, TrailBlazer, Silverado, Tahoe, Yukon, Sierra, HUMMER and other GM SUV/truck owners may comment on an illuminated malfunction indicator lamp (MIL), with a Reduced Engine Power message displayed. We have tried these methods to fix it: 1. replaced the accelerator and the sensor. Codes p2135 p1516 p0220 I have 2004 Tahoe that goe into reduced engine power and stability control diabled while driving. 4. 2. Read this article to learn more about the DBW system, and how to fix this common problem. Question: I have a 2004 Chevy Silverado which i just purchased today. 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