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Diagnostic Aids

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A TFP position switch (Pressure Switch Assembly) malfunction could set DTC P1870. First diagnose and clear any engine and TP sensor DTCs that are present, then inspect for any transmission DTCs that may have reset. Ensure final drive ratio matches VCM calibration. The following mechanical conditions could set DTC P1870: shift solenoids, TCC PWM solenoid, internal transmission failures or engine misfire.

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