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Home >> Mazda >> 2003 >> B2300 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1780: Transmission Control Switch Malfunction Or Transmission Control Indicator Light Circuit Malfunction >> Possible Causes

Possible Causes

Possible causes are:

Damaged indicator bulb and/or fuse.
Damaged TCS.
Damaged PCM.
Open or short circuit.

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