Fail safe mode P2104, P0708, P2131, P2126, P2121, P1702

Here is what the codes mean,

P2104 - Throttle Actuator Control System - Forced Idle: This code indicates that there is a problem with the throttle actuator control system, specifically a forced idle condition. It suggests that the throttle body or the electronic throttle control system is not functioning properly, potentially leading to a forced idle state. Further diagnosis is required to identify the exact cause of the issue.

P0708 - Transmission Range Sensor Circuit High Input: This code indicates that the transmission range sensor, also known as the neutral safety switch or gear position sensor, is reporting a high input signal. It typically signifies a problem with the sensor or its associated wiring. The transmission range sensor is responsible for detecting the position of the gear selector and providing that information to the engine control module (ECM) and transmission control module (TCM). A malfunction in this sensor can affect the proper operation of the transmission.

P2131 - Throttle/Pedal Position Sensor/Switch 'F' Circuit Low: This code indicates a low voltage condition in the throttle/pedal position sensor or switch 'F' circuit. It suggests a problem with the sensor or its associated wiring. The throttle/pedal position sensor is responsible for detecting the position of the accelerator pedal and providing that information to the ECM. A low voltage condition can cause drivability issues and may require repair or replacement of the sensor.

P2126 - Throttle/Pedal Position Sensor/Switch 'E' Circuit: This code indicates a problem with the throttle/pedal position sensor or switch 'E' circuit. It suggests a malfunction or a short circuit in the sensor or its associated wiring. Similar to P2131, this code relates to the throttle/pedal position sensor's function in detecting the accelerator pedal position. Proper diagnosis is necessary to identify the specific cause and recommend appropriate repairs.

P2121 - Throttle/Pedal Position Sensor/Switch 'D' Circuit: This code indicates a fault in the throttle/pedal position sensor or switch 'D' circuit. It suggests an issue with the sensor or its associated wiring, similar to P2131 and P2126. The throttle/pedal position sensor's proper operation is crucial for accurate throttle control and engine performance.

P1702 - Transmission Range Sensor Circuit Intermittent: This code suggests an intermittent issue with the transmission range sensor circuit. It indicates that there may be intermittent electrical connections, wiring problems, or a faulty sensor causing inconsistent transmission range information to be transmitted to the ECM or TCM.

So these codes for the safe mode I would replace the throttle actuator and the throttle pedal sensor assembly. Please start a new thread for the Transmission Range Sensor problems because we only handle one problem per thread, here is how to change the parts out in the images below. Check out the images (Below). Please let us know what happens.