P1702 – Transmission Range Sensor Circuit Fault (Ford)

Description

P1702 on Ford vehicles indicates a fault in the Transmission Range (TR) sensor circuit or the signals used to determine the selected gear position. The problem may be caused by the sensor itself, wiring, connectors, power or ground faults, or related transmission circuits. Diagnosis should confirm the electrical fault before the TR sensor is replaced.

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Symptoms

Engine may not crank in Park or Neutral
Incorrect or missing gear position display
Harsh or abnormal shifting
Transmission warning or Check Engine Light
Vehicle may enter fail-safe or limited transmission operation
Intermittent starting or gear-selection problems

Causes

Faulty or misaligned Transmission Range (TR) sensor
Open or short circuit in TR sensor wiring
Corroded, loose or damaged transmission connectors
Power supply or ground fault in the TR sensor circuit
Damaged transmission harness
Related transmission sensor or shared circuit fault
PCM or TCM fault in rare cases

Diagnosis

Read and record all transmission-related fault codes
Check live transmission range data while moving the selector through each gear position
Inspect the TR sensor connector and transmission wiring for corrosion, damage or loose terminals
Check the TR sensor power supply and ground circuits
Test TR sensor signal circuits for open or short circuits
Check selector cable or linkage adjustment where applicable
Compare the indicated gear position with the actual selector position
Follow the Ford-specific diagnostic procedure for the transmission fitted to the vehicle

Repair

Repair damaged wiring, terminals or connectors
Correct power or ground faults in the TR sensor circuit
Adjust the selector linkage if testing confirms incorrect adjustment
Replace the Transmission Range sensor only if testing confirms it is faulty
Repair related transmission wiring or shared sensor circuits when identified
Diagnose PCM or TCM faults only after external circuits and components have been verified