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The A/T P (automatic transmission park) indicator on the dash normally illuminates when the vehicle may be in danger of drifting, due to the transfer case being shifted into neutral. This (drift) can happen even when the transmission is in park - since the transfer case effectively disconnects the upper drivetrain, when shifted out-of-gear.

If the transfer case is properly shifted in H or L ranges (not neutral) and the indicator is illuminated, then there may be an adjustment needed in linkages or switch positions or even a malfunction in the circuit, such as a bad switch (i.e neutral safety, transfer indicator) or in the other associated electrical components.

The Toyota A340F transmission manual contains troubleshooting procedures for determining such malfunctions, including the false indication of an A/T P lamp, (visible on the dash combination meter).

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12y ago

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