DTC P1717: A/T Drive Range Signal Circuit Malfunction: Condition

WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when Engine Control Module (ECM) detects no Drive range signal while driving vehicle. ECM continuously monitors this circuit. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:

Open circuit between Transmission Control Module (TCM) and ECM.
Transmission range sensor malfunction.
Open circuit between transmission range sensor and TCM.
Open TCM power or ground circuit.
TCM malfunction.
ECM malfunction.