DTC P0819-00: M Position Switch/Up Switch/Down Switch Signal Error (TCM): Outline
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0819:00 (TCM, ET6A-EL, ET6AX-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.
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| Fail-safe |
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| 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
- 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
- Short to power supply in any of the following selector lever component circuits
- Open circuit in any of the following selector lever component circuits
- Shift panel (indicator) malfunction
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 Courtesy of MAZDA MOTORS CORP.
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