DTC P0641 (19-21 PGM-FI System: 9-Speed A/T)
DTC P0641 : Sensor Reference Voltage A Malfunction
NOTE: Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the A/T System .
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P0641 Sensor Reference Voltage A Malfunction |
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 for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0641 Sensor Reference Voltage A Malfunction Is DTC P0641 indicated?
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 PCM and these parts. 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, or How to Troubleshoot the A/T System .
- MAP sensor
- EGR valve
- Fuel rail pressure sensor
- Throttle body
- APP sensor
- Determine possible failure area (VCC lines, others)
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
MAP sensor 3P connector EGR valve 5P connector Fuel rail pressure sensor 3P connector Throttle body 6P connector APP sensor 6P connector - 3. Turn the vehicle to the ON mode.
- 4. Turn the vehicle to the OFF (LOCK) mode.
- 5. Turn the vehicle to the ON mode.
- 6. Clear the DTC with the HDS.
- 7. Check for Pending or Confirmed DTCs with the HDS.
DTC Description Confirmed DTC Pending DTC P0641 Sensor Reference Voltage A Malfunction Is DTC P0641 indicated?
YES
Go to step 4.
NO
Go to step 3.
- Shorted part check
- 1. Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a time:
- MAP sensor
- EGR valve
- Fuel rail pressure sensor
- Throttle body
- APP sensor
DTC Description Confirmed DTC Pending DTC P0641 Sensor Reference Voltage A Malfunction Is DTC P0641 indicated?
YES
Replace the part that caused the DTC when it was reconnected.
NO
Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1.
- MAP sensor
- EGR valve
- Fuel rail pressure sensor
- Throttle body
- APP sensor
- Shorted wire check (VCC lines)
- 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 A (50P) PCM connector E (80P) - 4. Check for continuity between these test points and body ground individually.
Test condition Vehicle OFF (LOCK) mode MAP sensor 3P connector: disconnected EGR valve 5P connector: disconnected Fuel rail pressure sensor 3P connector: disconnected Throttle body 6P connector: disconnected APP sensor 6P connector: disconnected PCM connector A (50P): disconnected PCM connector E (80P): disconnected Connector Terminal PCM connector A (50P) - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021)No. 48 PCM connector E (80P) - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021) .No. 50 and No. 68 Is there continuity?
YES
Repair a short in the VCC wire (s) between the PCM (A48, E50, E68) and each part that was disconnected in step 2.
NO
Go to step 5.
- Shorted wire check (VCC lines to power)
- 1. Turn the vehicle to the ON mode.
- 2. Measure the voltage between these test points and body ground individually.
Test condition Vehicle ON mode MAP sensor 3P connector: disconnected EGR valve 5P connector: disconnected Fuel rail pressure sensor 3P connector: disconnected Throttle body 6P connector: disconnected APP sensor 6P connector: disconnected PCM connector A (50P): disconnected PCM connector E (80P): disconnected Connector Terminal PCM connector A (50P) - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021)No. 48 PCM connector E (80P) - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021)No. 50 and No. 68 Is there any voltage?
YES
Repair a short to power in the VCC wire (s) between the PCM (A48, E50, E68) and each part that was disconnected in step 2.
NO
The VCC wires are 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 (19-21 9-Speed A/T) , then recheck. If DTC P0641 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (19-21 9-Speed A/T) .