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Jerry
Jerry, Master Mechanic
Category: Jeep
Satisfied Customers: 17009
Experience:  ASE Master...30+ years...Shop owner..engine builder..collision structural repair
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My 2005 jeep liberty displays part time when i am in two wheel

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My 2005 jeep liberty displays "part time when i am in two wheel drive and the light goes out inXXXXX My odometer displays P0839 and PO 837 when I turn the ignition on 3 times. Is this serious or just a sensor malfunction?

Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.

 

It sounds like it might just be a bad tranfer case position sensor. Let me give you tests for the trouble codes. Notice that on the P0837 it says to address any other tranfer case codes first, (the P0839)

 

 

P0839

 

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SYMPTOM
P0839-4WD MODE SENSOR HIGH

WHEN MONITORED
Continuously with the ignition key on.

SET CONDITION
When the 4WD Mode Sensor input circuit voltage raises above 4.78 volts for 5.72 seconds .

POSSIBLE CAUSES

  • Transfer case position sensor input circuit open
  • Transfer case position sensor input circuit short to voltage
  • Transfer case position sensor
  • Powertrain/engine control module
  • Intermittent operation

 

P0837

 

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SYMPTOM
P0837-4WD MUX SWITCH PERFORMANCE

WHEN MONITORED
Continuously with the ignition on.

SET CONDITION
The 4WD mixed switch input detected in an invalid range or irrational switch state.

POSSIBLE CAUSES

  • Related DTCs present
  • Transfer case shifter out of adjustment
  • Transfer case position sensor out of tolerance
  • Powertrain/engine control module

 

 

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Jerry and 4 other Jeep Specialists are ready to help you
Customer: replied 7 years ago.
Will not fixing the position sensor have any effect on the four wheel drive...will it still work when i shift into 4 wheel?
It should work in 4WD when you select it, however the modules will not know what gear you are really in. Hard to say what will happen over time, never tried it.