DTC P2122, P2123 (1.5 L Engine)

DTC P2122:  Accelerator Pedal Position (APP) Sensor A (Throttle Position (TP) Sensor D) Circuit Low Voltage DTC P2123:  Accelerator Pedal Position (APP) Sensor A (Throttle Position (TP) Sensor D) Circuit High Voltage

General Description 

Courtesy of HONDA, U.S.A., INC.

Accelerator pedal position (APP) sensor A is a part of the electronic throttle control system. It is used to convert the position of the accelerator pedal into electrical signals. Based on these signals, the powertrain control module (PCM) controls the throttle actuator so that the throttle position agrees with the accelerator pedal position. If the signal voltage from APP sensor A is a set value, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type 

Enable Conditions 

Malfunction Threshold 

DTC: P2122 

The APP sensor A output voltage [APP Sensor A Voltage] is 0.2 V or less for at least 200 milliseconds.

DTC: P2123 

The APP sensor A output voltage [APP Sensor A Voltage] is 4.9 V or more for at least 200 milliseconds.

[ ]: HDS Parameter

Possible Cause 

NOTE:  The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

DTC: P2122 

• APP sensor A APS1 line open
• APP sensor A VCC line open
• APP sensor A APS1 line short to ground

DTC: P2123 

• APP sensor A APS1 line short to APP sensor A VCC line
• APP sensor A SG line open

Common 

• APP sensor A failure
• PCM internal circuit failure

Diagnosis Details 

Conditions for setting the DTC 

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC 

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.