DTC P0819-00: M Position Switch/Up Switch/Down Switch Signal Error: Outline

DTC P0819:00 (TCM, GW6AX-EL, US) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	M position switch/Up switch/Down switch signal error
Detection condition	Under the following conditions, any of (1) to (4) conditions occurs for 1 s: Engine is running. Battery voltage is 8 V or more. Transaxle range sensor related DTC is not recorded. M position switch signal is on even though forward oil pressure switch is on in any position other than D position. M position switch signal is off even though up or down switch signal is on in D position. Up switch signal is on even though M position switch signal is off in any position other than D position. Down switch signal is on even though M position switch signal is off in any position other than D position.
Fail-safe	Inhibits manual mode.
Possible cause	Body control module (BCM) has detected shift panel (indicator) related DTCs. Selector lever component connector or terminals malfunction Selector lever component malfunction M position switch malfunction Up switch malfunction Down switch malfunction Open circuit in selector lever component ground circuit Shift panel (indicator) connector or terminals malfunction Short to ground in any of the following selector lever component circuits Signal circuit Short to power supply in any of the following selector lever component circuits Signal circuit Open circuit in any of the following selector lever component circuits Signal circuit Shift panel (indicator) malfunction
Courtesy of MAZDA MOTORS CORP.