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DTC P2127: Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage
This is right out of factory service repair manual , don't google stuff may not be accurate.
If you look under the steering wheel at the gas pedal you will see connectors at the Accelerator Pedal . position sensors inside gas pedal .
Circuit/System Description
The throttle actuator control (TAC) system uses two accelerator pedal position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit.
Two processors are also used to monitor the TAC system data. Both processors are located within the engine control module (ECM). Each signal circuit provides both processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.
It's not see wide open throttle like other guy says .
P2127
The ECM detects that APP sensor 2 voltage is less than 0.16 volt for greater than 0.5 second.
Action Taken When the DTC Sets
• DTCs P2120, P2122, P2123, P2125, P2127, P2128, and P2138 are Type A DTCs.
• The ECM commands the TAC system to operate in Reduced Engine Power mode.
Anytime the vehicle goes into reduced engine power mode A/C shuts off - cruise control won't work etc..
It's all tied together in the computer system . When you start to loose control the computer takes over reducing engine power , applying brakes etc... to bring vehicle back into control . The throttle body on your vehicle is computer controlled . electronic throttle control . the gas pedal has sensors , the throttle body has sensors an a electric motor . The lights came on because the computer disabled these systems .
{: ) The stabiltrak light is just an after effect of the check engine light. When the system detects inconsistencies with the accelerator pedal position and throttle position sensors, it will enter into "Limp Mode", engine power will be reduced and you cannot accelerate normallly as you expected. So that you can LIMP your way back home, or to a nearest service shop. A P2138 code may be set, or its conjunctions. Before you decide to have it serviced, if you have the time, try to disconnect the connector at the accelerator pedal. Check for any backed out terminals. Then reconnect again firmly. When you hear it clicks in, it's firmly seated. Testdrive. If not okay, you do the same thing to the throttle position connector. It's on the side of the throttle body. I hope you get lucky.
THIS IS A NEW CAR. LET THE WARRANTY FIX IT. BUT CHECK THE ACCELERATOR PEDAL POSITION SENSOR.ITS PART OF ACCELERATOR PEDAL ASSEMBLY.MAKE SURE ITS NOT LOOSE OR MISSING NUTS.ALSO MAKE THE ELECTRICAL WIRE IS STILL INTACT.
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