What Does P1592 Mean?
This code is specific to manual transmission vehicles and indicates a fault in the neutral position switch circuit. On manual transmission vehicles, this switch typically detects whether the transmission is in neutral or a gear is selected, and it is used for clutch safety interlock and idle speed control logic. The fault may prevent proper idle behavior or clutch interlock function.
Common Causes
30%
Failed neutral position switch on the manual transmission
25%
Misadjusted or worn shift linkage affecting switch engagement
20%
Wiring fault between the neutral switch and PCM
15%
Corroded connector at the transmission-mounted switch
10%
Damaged switch due to transmission fluid contamination
Diagnostic Steps
1
Monitor the neutral switch status on live data while shifting through neutral and all gear positions; verify it toggles correctly.
2
Locate the neutral switch on the transmission housing and inspect its connector for corrosion, damage, or looseness.
3
Check the switch operation with a DVOM—it should show continuity in neutral and open circuit in gear (or vice versa depending on design).
4
Inspect the shift linkage for excessive play or wear that may prevent proper switch actuation.
5
Replace the switch if it does not operate correctly; verify proper adjustment after installation.
Estimated Repair Cost
$80 - $300
Parts + labor, varies by vehicle and location
This code is specific to manual transmission vehicles and indicates a fault in the neutral position switch circuit. On manual transmission vehicles, this switch typically detects whether the transmission is in neutral or a gear is selected, and it is used for clutch safety interlock and idle speed c...
The most common cause of P1592 (Neutral position switch circuit (MT model)) is: Failed neutral position switch on the manual transmission
Typical repair costs for P1592 range from $80 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A faulty neutral switch on a manual transmission may disable the clutch safety interlock, potentially allowing the engine to start in gear. It may also affect idle speed control when the transmission is in neutral.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1592 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Clutch Interlock
Difficulty
Type
Manufacturer
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