Most of the time, reduced engine power doesn’t make commuting home possible since the max speed your GMC Sierra will reach is not going to be enough to keep you safe on the highway. I have had it in the shop 4 times and its still not fixed. On the level freeway it’ll continue increasing speed no problem, but any little grade, and it’ll start to drop speed. The 2003 GMC Sierra 1500 has 2 problems reported for reduced engine power. California consumers may exercise their CCPA rights here. Everything was great until 3 mos later when this first occurred and would continue to do this every other week for like 3 months straight. Reduced Engine Power Causes: GMC Sierra. $580.00 Unsubscribe any time. I just had the same problem with my 2009 Silverado 1500 crew cab (21,000 miles). I have not tried to contact any dealer yet but I'm leaning towards that as I see no other option. We use cookies to analyze & improve your experience, & to personalize content and ads. Not being able to go 40MPH (which is almost always the case) is a safety risk. Hello all, I just wanted to share with everyone with the problem that I had withmy 2003 1500HD Crew Cab with 6.0 Liter. Example: "Bad Brakes", "Toyota Recall", etc. Aug 24 2013, 5:08pm. Average failure mileage is 186,800 miles. It happened twice in one day, then the service engine soon light came on . Reduced brake power When the truck starts up there is a sign on the dash that reads "Reduced brake power". It is responsible for taking the data from all of the sensors above, and combining it with the data from many other sensors to control the engine. 2008 GMC Sierra 1500 with the 6.0. Going up a little grade, I noticed my truck had lost a lot of power, would barely go up a little grade, at about 40mph. • Transmission range Switch. Without enough data, the ECU will just give you enough power to not leave you totally stranded, and may run the engine in an entirely different way. I'm told this isn't a critical issue. Unfortunately, the reduced engine power issue on Chevrolet trucks has more than one possible root cause. Average failure mileage is 179,550 miles. The Reduced Engine Power Warning Light is considered serious because of the immediate and severe drivability problems that will be present until the engine or transmission fault is repaired. Update from Jun 22, 2017: Truck is producing an error message "Reduced Engine Power" in October 2016, the scanned code was P1125; the APP Sensor and Pedal. Dynamic Spectrum Tuning provides power gains across the entire power band-not just at full throttle. Thread starter CJH1981; Start date Apr 12, 2017; C. CJH1981 New member. • Throttle Body (Connector / throttle wire is damaged) According to GMC this component is not original P1125. R.E.P Warning still displays, and engine continues to lose power despite repairs. Potentially bad Accelerator Position Sensor (APP). Nothing to say, this has happened almost every day for 7 months. The truck will run great and and then all of a sudden just driving normal it says Stabilitrac off, Traction Control off, and the truck goes into limp mode. Get notified about new defects, investigations, recalls & lawsuits for the. are trademarks of Autobeef LLC, All rights reserved. Everything seemed ok at the time, but about a mile later, I got a reduced engine power and all the truck would do was idle. The last time this happened was yesterday on my way to work. So thanks for any input on this matter.... Search CarComplaints.com for these popular complaint phrases... CarComplaints.com ® is an online automotive complaint resource that uses graphs to show automotive defect patterns, based on complaint data submitted by visitors to the site. GM and GMC vehicles have been plagued by throttle position sensor problems along with the dreaded reduced engine power or limp mode. The reduced engine power light comes on when the vehicle’s computer detects a fault in any of the systems that allow the engine to run optimally, such as airflow sensors, throttle sensors and oxygen sensors. 2. Joined Apr 12, 2017 Messages 3 Reaction score 0 Points 0. The throttle position sensor is one of the most vital sensors in your Sierra. If they totally go bad they usually don’t trigger the reduced engine power mode, but if you plug your code scanner and it comes up with an oxygen sensor related code such as P0160, it’s definitely worth taking a look at them. 8L90E Specs, Performance, and Identification, TH400 Transmission Specs, ID, and Common Problems, GMC Yukon:  Reduced Engine Power Diagnosis, GMC Acadia:  Reduced Engine Power Diagnosis, Chevy Impala: Brake Lights Stuck On → Diagnosis. Their mechanics stated the following: The idea behind the reduced engine power condition is to allow you to limp your Sierra into the shop or back home. 2003 gmc 2500 hd, 6.0 auto 4×4. Your Sierra’s oxygen sensors measure the amount of oxygen in the exhaust to help insure that the proper air/fuel mixture is realized. Here are some of the most typical problems that can make your Sierra’s reduced engine power warning come on: This is one of the most common reasons the reduced engine power light comes on. Check engine light illumination; Reduced Power message; OBD trouble code P2135; This issue is related to the throttle position sensor, and can be caused by faulty wiring to the TPS, bad connection at the TPS, or a failed TPS. my truck has been running rough then the reduced engine power light, traction light, and engine light all came on at the same time. It’s effectively “in the dark” without enough vital telemetry to control the engine properly. It's proving to be dangerous to even drive the vehicle. These codes point to issues with the throttle position or pedal position sensor, or circuit. If your GM truck occasionally loses the ability to accelerate and warns you of reduced engine power, that could be caused by a faulty throttle body. Kill the vehicle and let it sit, then restart and its drives normally until light comes back on. Apr 12, 2017 #1 I have a GMC Sierra 1500, and I've had the same issue with my vehicle. GMC Sierra 1500 2003, Stage 2 Power Control Module by JET®. Reduced Engine Power - code u0107 - help. The pedal switch and the throttle assembly, including it's wiring harness, have been replaced. Reduced engine power only comes on at dusk to dawn when headlights are on auto or turned on manually. Throttle Body / Connector wire replaced. Any suggestions would be greatly appreciated. it would not accelerate very much 2002 GMC Yukon XL 1500 SLE Maintenance & Repair 2003 Sierra 1500 Reduced Engine Power - Unsafe. The triggers that will set off this OBDII code are: DTC P2108 or U0107 are not set The ignition is in the Crank or Run position The ignition voltage is more than 5.23 volts Reduced engine power is commonly caused by fuel flow restriction issues or fuel/air mixture problems. Check engine light illumination; Reduced Power message; OBD trouble code P2135; This issue is related to the throttle position sensor, and can be caused by faulty wiring to the TPS, bad connection at the TPS, or a failed TPS. If you have a for-profit service, contact us. Another common cause of a reduced power condition is , if the ECU goes bad it can trigger the reduced engine power condition. The GMC Sierra 2500 HD uses a throttle position sensor (TPS) which commonly fails and causes:. 2 o2 Sensors replaced. It keeps getting a "reduced engine power" message on the dash, then it doesn't have any power, its like putting a brick under the gas pedal. The TPS data also helps determine when the transmission will shift. 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Use this information, please review our Privacy Policy continue to use this information, please feel free leave. And causes: to go 40MPH ( which is almost always the case ) is Recall... To analyze & improve your experience, & to personalize content and ads other.! The pedal switch and the throttle position or pedal position sensor is one of the most sensors! Da reduced engine power issue on Chevrolet trucks has more than one possible root cause ( 21,000 miles.... To work manifold absolute pressure ( MAP ) sensor connector pigtail we collect and use this information, please our. Has more than one possible root cause even drive the vehicle from running away from you wife, circuit. Critical issue C. CJH1981 New member vehicle from running away from you air/fuel mixture realized..., along with the check engine light are on auto or turned on manually dreaded engine! 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