DTC Advanced Diagnostics: P0122, P0123
DTC P0122:Throttle Position (TP) Sensor A Circuit Low Voltage
DTC P0123:Throttle Position (TP) Sensor A Circuit High Voltage

General Description


The powertrain control module (PCM) monitors the throttle position (TP) sensor A circuit and the throttle position (TP) sensor B circuit for electrical malfunctions. In order to provide electrical diagnostics the output voltage of both sensors are continuously monitored and compared with minimum and maximum thresholds. If the TP sensor A output voltage is a specified value for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
0.14 second or more
DTC Type
One drive cycle, MIL on

Enable Conditions
Condition
 
State of the engine
Running

Malfunction Threshold
DTC: P0122

The TP sensor A output voltage [TP Sensor A] is less than 0.2 V for at least 0.14 second.

DTC: P0123

The TP sensor A output voltage [TP Sensor A] is greater than 4.8 V for at least 0.14 second.

[ ]: 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: P0122
TP sensor A THL1 line short to ground
TP sensor A VCC line open

DTC: P0123
TP sensor A THL1 line short to power
TP sensor A THL1 line open
TP sensor A SG line open

Common
Throttle body failure (TP sensor A)
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.