Diagnostic Aids

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If the TCC is mechanically stuck ON with the parking brake applied and any gear range selected, the TCC fluid mechanically applies the TCC. TCC fluid mechanically applying the TCC can cause an engine stall.
A stuck TP sensor may set a DTC P0742.
DTC P0742 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.