Rick's Free Auto Repair Advice

Posts Tagged: P2138

Reduced Engine Power

Reduced Engine Power light on and P2138 Reduced Engine Power trouble code The reduced engine power message appears on GM vehicles when the engine controls have detected a problem that can cause a safety issue. For example, the electronic accelerator pedal position sensor (APP) (fly by wire) sends multiple signals to the engine control to tell it how much and how fast to open the electronic throttle body. The APP has multiple potentiometers for redundancy. However, if the signals don’t correlate as the computer expects, it will reduce available engine power … Read More

P1516 P2135 P2138

Fix codes P1516 P2135 P2138 GM has issued a technical service bulletin (TSB) 07-06-04-003 to address a problem with a reduced power and REPEATING trouble codes P1516 P2135 P2138 on the following vehicles: 2005-2006 Chevrolet Cobalt, Cobalt SS, Malibu 2006 Chevrolet Colorado, TrailBlazer 2006 GMC Canyon, Envoy 2006 HUMMER H3 2005-2006 Saturn ION, ION Red Line 2006 Saab 9-7X The codes P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance, P2135 Throttle Position (TP) Sensor 1-2 Correlation, P2138 Accelerator Pedal Position (APP) Sensor 1-2 Correlation, may NOT require replacement. … Read More

P2122 P2138 P2127 Sante Fe

Fix code P2122 P2138 P2127 Sante Fe If you own a Hyundai Sante Fe and encounter P2122 P2138 P2127 codes, head right for the accelerator pedal sensor (APS), also known as the Gas Pedal. Using a digital multimeter, check for 5 volts at the green wire at terminal 8. Next, check for ground at the black/white wire at terminal 7. Then check for .3-.8 volts at the white wire (with your foot off the pedal) and 4-5 volts with the pedal fully depressed. Wiggle the wiring harness and connector while … Read More


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