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P1729 - 4X4L Switch

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P1729 - 4X4L SWITCH

Description:  The 4x4L switch is an on/off switch. If the powertrain control module (PCM) does not sense appropriate voltage when the switch is cycled on and off, a DTC sets for mechanical shift on the fly systems.
Possible Causes: 
  • The 4x4L harness between the PCM and the 4x4L switch is open or shorted
  • Damaged 4x4L switch
Diagnostic Aids:  Verify the 4x4L switch cycles on/off.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   Refer to the Workshop article part 308-07A, Four-Wheel Drive Systems.
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