# P1738 on the 2014 Mazda Mazda3

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name P1738

- [10237199](https://open.wenmarpro.com/bulletins/10237199), 2023-06-04: Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory \(P0842, P0847, P0872, P0877, P0780, P1738\).
- [10213404](https://open.wenmarpro.com/bulletins/10213404), 2022-06-06: Check Engine light and A/T Warning light on with one or more of these DTS \(P0842, P0847, P0872, P0877, P0780, P1738\) Stored in TCM Memory
- [10201768](https://open.wenmarpro.com/bulletins/10201768), 2021-10-02: Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory \(P0842, P0847, P0872, P0877, P0780, P1738\). P0842:00 \- Oil pressure switch No. 1 \(oil pressure switch B\) stuck on, P0847:00 \- Oil pressure switch No. 2 \(oil pressure switch A\) stuck on, P0872:00 \- Oil pressure switch No. 3 \(oil pressure switch A\) stuck on, P0780:00 \- Gear shifting malfunction, P1738:00 Automatic transaxle internal malfunction. This is caused by the oil pressure switch A and/or B at the control valve body temporarily or permanently getting stuck due to contamination entering the passage. To correct the problem, some mass production changes have been implemented to reduce contamination and improve the DTC diagnostic logic. NOTE: If the vehicle also has a delayed engagement concern, this TSB is not applicable. Refer to the instructions on MGSS \(SLOW ENGAGING AFTER OPERATING SELECTOR LEVER FROM N TO D POSITION \[FW6A\-EL/FW6AX\-EL\]\) or \(SLOW ENGAGING AFTER OPERATING SELECTOR LEVER FROM N TO D POSITION \[EW6A\-EL/EW6AX\-EL\]\) for proper diagnosis and repair procedure.
- [10177843](https://open.wenmarpro.com/bulletins/10177843), 2020-08-04: Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory \(P0842, P0847, P0872, P0877, P0780, P1738\). This is caused by the oil pressure switch A and/or B at the control valve body temporarily or permanently getting stuck due to contamination entering the passage. To correct the problem, some mass production changes have been implemented to reduce contamination and improve the DTC diagnostic logic.
- [10160555](https://open.wenmarpro.com/bulletins/10160555), 2019-05-30: Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory \(P0842, P0847, P0872, P0877, P0780, P1738\). P0842:00 \- Oil pressure switch No. 1 \(oil pressure switch B\) stuck on P0847:00 \- Oil pressure switch No. 2 \(oil pressure switch A\) stuck on P0872:00 \- Oil pressure switch No. 3 \(oil pressure switch A\) stuck on P0877:00 \- Oil pressure switch No. 4 \(oil pressure switch B\) stuck on P0780:00 \- Gear shifting malfunction P1738:00 \- Automatic transaxle internal malfunction This is caused by the oil pressure switch A and/or B at the control valve body temporarily or permanently getting stuck due to contamination entering the passage. To correct the problem, some mass production changes have been implemented to reduce contamination and improve the DTC diagnostic logic. NOTE: If the vehicle also has a delayed engagement concern, this TSB is not applicable. Refer to the instructions on MGSS \(SLOW ENGAGING AFTER OPERATING SELECTOR LEVER FROM N TO D POSITION \[FW6A\-EL/FW6AX\-EL\]\) or \(SLOW ENGAGING AFTER OPERATING SELECTOR LEVER FROM N TO D POSITION \[EW6A\-EL/EW6AX\-EL\]\) for proper diagnosis and repair procedure.
- [10136780](https://open.wenmarpro.com/bulletins/10136780), 2018-05-14: Some vehicles may experience the check engine light and automatic transaxle warning light ON with one or more of these DTCs stored in the TCM memory \(P0842, P0847, P0872, P0877, P0780, P1738\). P0842:00 \- Oil pressure switch No. 1 \(oil pressure switch B\) stuck on P0847:00 \- Oil pressure switch No. 2 \(oil pressure switch A\) stuck on P0872:00 \- Oil pressure switch No. 3 \(oil pressure switch A\) stuck on P0877:00 \- Oil pressure switch No. 4 \(oil pressure switch B\) stuck on P0780:00 \- Gear shifting malfunction P1738:00 Automatic transaxle internal malfunction This is caused by the oil pressure switch A and/or B at the control valve body temporarily or permanently getting stuck due to contamination entering the passage. To correct the problem, some mass production changes have been implemented to reduce contamination and improve the DTC diagnostic logic. NOTE: If the vehicle also has a delayed engagement concern, this TSB is not applicable. Refer to MGSS online for proper diagnosis and repair procedure.
- [10105656](https://open.wenmarpro.com/bulletins/10105656), 2017-06-08: SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT AND AUTOMATIC TRANSAXLE WARNING LIGHT ON WITH ONE OR MORE OF THESE DTCS STORED IN THE TCM MEMORY \(P0842, P0847, P0872, P0877, P0780, P1738\). • P0842:00 \- OIL PRESSURE SWITCH NO. 1 \(OIL PRESSURE SWITCH B\) STUCK ON • P0847:00 \- OIL PRESSURE SWITCH NO. 2 \(OIL PRESSURE SWITCH A\) STUCK ON • P0872:00 \- OIL PRESSURE SWITCH NO. 3 \(OIL PRESSURE SWITCH A\) STUCK ON • P0877:00 \- OIL PRESSURE SWITCH NO. 4 \(OIL PRESSURE SWITCH B\) STUCK ON • P0780:00 \- GEAR SHIFTING MALFUNCTION • P1738:00 AUTOMATIC TRANSAXLE INTERNAL MALFUNCTION THIS IS CAUSED BY THE OIL PRESSURE SWITCH A AND/OR B AT THE CONTROL VALVE BODY TEMPORARILY OR PERMANENTLY GETTING STUCK DUE TO CONTAMINATION ENTERING THE PASSAGE. TO CORRECT THE PROBLEM, SOME MASS PRODUCTION CHANGES HAVE BEEN IMPLEMENTED TO REDUCE CONTAMINATION AND IMPROVE THE DTC DIAGNOSTIC LOGIC. NOTE: IF THE VEHICLE ALSO HAS A DELAYED ENGAGEMENT CONCERN, THIS TSB IS NOT APPLICABLE. REFER TO MS3 ONLINE INSTRUCTIONS OR WORKSHOP MANUAL FOR PROPER DIAGNOSIS AND REPAIR PROCEDURE.
- [10098204](https://open.wenmarpro.com/bulletins/10098204), 2017-05-04: SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT AND AUTOMATIC TRANSAXLE WARNING LIGHT ON WITH DTC P0842, P0847, P0872 AND/OR P0877 STORED IN THE TCM MEMORY.•P0842:00 \- OIL PRESSURE SWITCH NO. 1 \(OIL PRESSURE SWITCH B\) STUCK ON•P0847:00 \- OIL PRESSURE SWITCH NO. 2 \(OIL PRESSURE SWITCH A\) STUCK ON•P0872:00 \- OIL PRESSURE SWITCH NO. 3 \(OIL PRESSURE SWITCH A\) STUCK ON•P0877:00 \- OIL PRESSURE SWITCH NO. 4 \(OIL PRESSURE SWITCH B\) STUCK ONTHE DTC P0780 AND/OR P1738 MAY ALSO BE STORED TOGETHER.•P0780:00 \- GEAR SHIFTING MALFUNCTION•P1738:00 \- AUTOMATIC TRANSAXLE INTERNAL MALFUNCTIONTHIS IS CAUSED BY THE OIL PRESSURE SWITCH A AND/OR B AT THE CONTROL VALVE BODY TEMPORARILY OR PERMANENTLY GETTING STUCK DUE TO CONTAMINATION ENTERING THE PASSAGE. TO CORRECT THE PROBLEM, SOME MASS PRODUCTION CHANGES HAVE BEEN IMPLEMENTED TO REDUCE CONTAMINATION AND IMPROVE THE DTC DIAGNOSTIC LOGIC.
- [10098203](https://open.wenmarpro.com/bulletins/10098203), 2017-05-04: SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT AND AUTOMATIC TRANSAXLE WARNING LIGHT ON WITH DTC P0842, P0847, P0872 AND/OR P0877 STORED IN THE TCM MEMORY.•P0842:00 \- OIL PRESSURE SWITCH NO. 1 \(OIL PRESSURE SWITCH B\) STUCK ON•P0847:00 \- OIL PRESSURE SWITCH NO. 2 \(OIL PRESSURE SWITCH A\) STUCK ON•P0872:00 \- OIL PRESSURE SWITCH NO. 3 \(OIL PRESSURE SWITCH A\) STUCK ON•P0877:00 \- OIL PRESSURE SWITCH NO. 4 \(OIL PRESSURE SWITCH B\) STUCK ONTHE DTC P0780 AND/OR P1738 MAY ALSO BE STORED TOGETHER.•P0780:00 \- GEAR SHIFTING MALFUNCTION•P1738:00 \- AUTOMATIC TRANSAXLE INTERNAL MALFUNCTIONTHIS IS CAUSED BY THE OIL PRESSURE SWITCH A AND/OR B AT THE CONTROL VALVE BODY TEMPORARILY OR PERMANENTLY GETTING STUCK DUE TO CONTAMINATION ENTERING THE PASSAGE. TO CORRECT THE PROBLEM, SOME MASS PRODUCTION CHANGES HAVE BEEN IMPLEMENTED TO REDUCE CONTAMINATION AND IMPROVE THE DTC DIAGNOSTIC LOGIC.
- [10098165](https://open.wenmarpro.com/bulletins/10098165), 2017-05-03: SOME VEHICLES MAY EXPERIENCE THE CHECK ENGINE LIGHT AND AUTOMATIC TRANSAXLE WARNING LIGHT ON WITH DTC P0842, P0847, P0872 AND/OR P0877 STORED IN THE TCM MEMORY.•P0842:00 \- OIL PRESSURE SWITCH NO. 1 \(OIL PRESSURE SWITCH B\) STUCK ON•P0847:00 \- OIL PRESSURE SWITCH NO. 2 \(OIL PRESSURE SWITCH A\) STUCK ON•P0872:00 \- OIL PRESSURE SWITCH NO. 3 \(OIL PRESSURE SWITCH A\) STUCK ON•P0877:00 \- OIL PRESSURE SWITCH NO. 4 \(OIL PRESSURE SWITCH B\) STUCK ONTHE DTC P0780 AND/OR P1738 MAY ALSO BE STORED TOGETHER.•P0780:00 \- GEAR SHIFTING MALFUNCTION•P1738:00 \- AUTOMATIC TRANSAXLE INTERNAL MALFUNCTION. NOTE: THIS SERVICE INFORMATION IS ALSO APPLICABLE IF DTC P0780:00 IS STOREED INDEPENDENTLY. THIS IS CAUSED BY THE OIL PRESSURE SWITCH A AND/OR B AT THE CONTROL VALVE BODY TEMPORARILY OR PERMANENTLY GETTING STUCK DUE TO CONTAMINATION ENTERING THE PASSAGE. TO CORRECT THE PROBLEM, SOME MASS PRODUCTION CHANGES HAVE BEEN IMPLEMENTED TO REDUCE CONTAMINATION AND IMPROVE THE DTC DIAGNOSTIC LOGIC.