DTC P0123 (19-21 9-Speed A/T)
DTC P0123 : Throttle Position (TP) Sensor A Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P0123 Throttle Position (TP) Sensor A Circuit High Voltage |
DTC (PGM-FI)
- Problem verification
-1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Turn the vehicle to the OFF (LOCK) mode.
- 4. Turn the vehicle to the ON mode.
- 5. Check the parameter (s) below with the HDS.
Signal Threshold Current conditions Values Unit Values Unit TP Sensor A More than 4.8 V Do the current condition (s) match the threshold?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems
- Determine possible failure area (SG3 line, others)
-1. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0123 Throttle Position (TP) Sensor A Circuit High Voltage P0223 Throttle Position (TP) Sensor B Circuit High Voltage Are DTC P0123 and P0223 indicated at the same time?
YES
Go to step 5.
NO
Go to step 3.
- Determine possible failure area (throttle body, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Throttle body 6P connector - 3. Turn the vehicle to the ON mode.
- 4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Throttle body 6P connector: disconnected Test point 1 Throttle body 6P connector (female terminals) No. 6: Test point 2 Body ground Is there about 5.0 V?
YES
NO
Go to step 4.
- Open wire check (THL1 line)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Jump the SCS line with the HDS, and wait more than 1 minute.
- 3. Disconnect the following connector.
PCM connector E (80P) - 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode
Throttle body 6P connector: disconnected PCM connector E (80P): disconnected Test point 1 Throttle body 6P connector (female terminals) No. 6: Test point 2 PCM connector E (80P) No. 72 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) .Is there continuity?
YES
The THL1 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM - Refer to: PCM Removal and Installation (9-Speed A/T 2019 2020 2021) , then recheck. If DTC P0123 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T 2019 2020 2021) .
NO
Repair an open in the THL1 wire between the PCM (E72) and the throttle body.
- Open wire check (SG3 line)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Jump the SCS line with the HDS, and wait more than 1 minute.
- 3. Disconnect the following connectors.
PCM connector E (80P) Throttle body 6P connector - 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode
PCM connector E (80P): disconnected Throttle body 6P connector: disconnected Test point 1 Throttle body 6P connector (female terminals) No. 3: Test point 2 PCM connector E (80P) No. 67 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021), .Is there continuity?
YES
The SG3 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM - Refer to: PCM Removal and Installation (9-Speed A/T 2019 2020 2021), , then recheck. If DTC P0123 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T 2019 2020 2021) .
NO
Repair an open in the SG3 wire between the PCM (E67) and the throttle body.