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Service bulletins for the 2016 Mazda MX-5

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

522 on file from NHTSA, as of 2026-10-19.

About P1738 on the 2016 Mazda MX-5: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: P1738 are shown. Show all

Bulletins, newest first
05-005-16-32182017-02-15. Service bulletin. ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION. 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 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.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.
05-005-16-32182016-12-02. Service bulletin. ENGINE. 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 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.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.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.