Park/Neutral Position Switch Out of Self-Test Range (Ford)
What does P1709 mean?
The P1709 code means the vehicle's onboard diagnostic system has detected: Park/Neutral Position Switch Out of Self-Test Range (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Engine starts in gear
- Backup lights inoperative
- Transmission stuck in one gear
- Gear indicator shows wrong position
Probable Causes (Ranked by Likelihood)
- Failed park/neutral position switch Very High
- Shift linkage misadjusted High
- Corroded switch connector on transmission Moderate
- Internal switch contact wear Moderate
Step-by-Step Diagnostic Procedure
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With a scan tool, monitor the PNP switch signal while shifting through all positions.
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Check that the shift linkage properly centers the transmission in each detent.
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Inspect the PNP switch connector on the transmission for corrosion or transmission fluid leakage.
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Measure the switch resistance at each gear position and compare to specifications.
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If the switch fails in one or more positions, replace it and adjust per Ford procedures.
Frequently Asked Questions
Is starting in gear dangerous?
Extremely. If the PNP switch fails to properly detect the gear position, the engine may start while the transmission is in Drive or Reverse, causing the vehicle to lurch forward or backward.
Is the PNP switch the same as the neutral safety switch?
Yes. The park/neutral position switch and neutral safety switch are the same component. It prevents starting in gear and provides gear position data to the PCM.
Can I adjust the PNP switch?
On some Ford models the PNP switch is adjustable by loosening the mounting bolts and rotating it. On others it must be replaced as a unit.