What Does P1797 Mean?
DTC P1797 indicates a fault in the park/neutral position switch circuit or the clutch pedal position switch, specifically an open or short condition. The TCM/PCM cannot reliably determine whether the transmission is in park/neutral or whether the clutch is depressed. This affects starter interlock operation and transmission shift logic.
Common Causes
30%
Defective park/neutral position switch (range sensor)
25%
Open or damaged wiring in the range sensor circuit
20%
Misadjusted transmission range sensor
15%
Faulty clutch pedal position switch (manual transmissions)
10%
Corroded connector at the range sensor or clutch switch
Diagnostic Steps
1
Use a scan tool to read the transmission range sensor PID; verify it correctly shows P, R, N, D, etc. as you move the shifter through each position.
2
If the reading is stuck or erratic, inspect the transmission range sensor connector for corrosion, moisture, or loose terminals.
3
Measure the resistance or voltage output of the range sensor in each gear position and compare to manufacturer specifications.
4
For manual transmissions, test the clutch pedal position switch with an ohmmeter; it should toggle between open and closed as the pedal is pressed.
5
Inspect wiring between the switch/sensor and the TCM for open circuits or shorts.
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
DTC P1797 indicates a fault in the park/neutral position switch circuit or the clutch pedal position switch, specifically an open or short condition. The TCM/PCM cannot reliably determine whether the transmission is in park/neutral or whether the clutch is depressed. This affects starter interlock o...
The most common cause of P1797 (P or N Range Signal or Clutch Pedal Position Switch Open or Short) is: Defective park/neutral position switch (range sensor)
Typical repair costs for P1797 range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A malfunctioning park/neutral switch can allow the engine to start in gear, creating a sudden vehicle lurch hazard, or prevent starting altogether.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1797 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Starting System
Difficulty
Type
Manufacturer
Recommended Tools
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