DTC Advanced Diagnostics: P2127, P2128 (1.5L Engine)
DTC P2127: Accelerator Pedal Position (APP) Sensor B (Throttle Position (TP) Sensor E) Circuit Low Voltage DTC P2128: Accelerator Pedal Position (APP) Sensor B (Throttle Position (TP) Sensor E) Circuit High Voltage
General Description
Accelerator pedal position (APP) sensor B 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 B is a set value, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 200 milliseconds or more |
| DTC Type | One drive cycle, MIL on |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
DTC: P2127
The APP sensor B output voltage [APP Sensor B Voltage] is 0.2 V or less for at least 200 milliseconds.
DTC: P2128
The APP sensor B output voltage [APP Sensor B Voltage] is 4.0 V or more for at least 200 milliseconds.
[ ]: HDS Parameter
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
DTC: P2127
- APP sensor B APS2 line open
- APP sensor B APS2 line short to ground
- APP sensor B VCC5 line open
DTC: P2128
- APP sensor B APS2 line short to APP sensor B VCC5 line
- APP sensor B SG5 line open
Common
- APP sensor B 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, the freeze data, and the on-board snapshot 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, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.