DTC P0138, P0158 (2016 2017)
DTC P0138 : Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage
DTC P0158 : Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage
NOTE:
- Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems
- Information marked with an asterisk (*) applies to the front bank (Bank 2).
| DTC Description | Confirmed DTC | Pending DTC | Freeze Frame |
|---|---|---|---|
| P0138 Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage | |||
| P0158 Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage |
DTC (PGM-FI)
- Problem verification
-1. Turn the vehicle to the ON mode.
- 2. Clear the DTC with the HDS.
- 3. Start the engine.
- 4. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Signal Current conditions Values Unit ECT SENSOR 1 Signal Current conditions Values Unit ENGINE SPEED - 5. Check the parameter (s) below with the HDS.
Signal Threshold Current conditions Values Unit Values Unit HO2S B1 S2 More than 1.27 V HO2S B2 S2 * More than 1.27 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 secondary HO2S (Sensor 2) and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems
- Determine possible failure area (secondary HO2S (Sensor 2), others)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Secondary HO2S (Sensor 2) 4P connector - 3. Connect terminals A and B with a jumper wire.
Terminal A Secondary HO2S (Sensor 2) 4P connector No. 1 Terminal B Secondary HO2S (Sensor 2) 4P connector No. 2 - 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 HO2S B1 S2 More than 1.27 V HO2SB2 S2 * More than 1.27 V Do the current condition (s) match the threshold?
YES
Go to step 3.
NO
- Open wire check (SO2SGB1 (SO2SGB2) * line):
- 1.Turn the vehicle to the OFF (LOCK) mode.
- 2. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
- 3. Connect terminals A and B with a jumper wire.
Rear bank (Bank 1):
Terminal A Rear secondary HO2S (Bank 1, Sensor 2) 4P connector No. 2 Terminal B Body ground Front bank (Bank 2):
Terminal A Front secondary HO2S (Bank 2, Sensor 2) 4P connector No. 1 Terminal B Body ground - 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 HO2S B1 S2 More than 1.27 V HO2S B2 S2 * More than 1.27 V Do the current condition (s) match the threshold?
YES
The SO2SGB1 (SO2SGB2) * wire is OK. Go to step 4.
NO
Repair an open in the SO2SGB1 (SO2SGB2) * wire between the PCM (C39 (C40) *) and secondary HO2S (Sensor 2).
- Open wire check (SO2B1 (SO2B2) * 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 C (51P) - 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode
Rear secondary HO2S (Bank 1, Sensor 2) 4P connector: disconnected Rear secondary HO2S (Bank 1, Sensor 2) 4P connector No. 2: jumped to body ground Front secondary HO2S (Bank 2, Sensor 2) 4P connector: disconnected * Front secondary HO2S (Bank 2, Sensor 2) 4P connector No. 1: jumped to body ground * PCM connector C (51P): disconnected Test point 1
PCM connector C (51P) No. 30 - Refer to:
PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018),
PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020)PCM connector C (51P) No. 31 * - Refer to:
PCM Connector for Inputs and Outputs (6-Speed A/T) (2016 2017 2018 2019 2020), or
PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)Test point 2 Body ground Is there continuity?
YES
The SO2B1 (SO2B2) * 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 (6-Speed A/T), (9-Speed A/T 2016 2017 2018) .
NO
Repair an open in the SO2B1 (SO2B2) * wire between the PCM (C30 (C31) *) and secondary HO2S (Sensor 2).