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Engine codes - P0838 & P0837. Is it my transfer case switch?
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Author:  ahjjones [ Mon Feb 07, 2011 12:12 am ]
Post subject:  Engine codes - P0838 & P0837. Is it my transfer case switch?
I've recently got these two engine codes, "P0838, and P0837. I found out they mean, "P0837 -Four Wheel Drive (4WD) Switch Circuit Range/Performance, P0838 -Four Wheel Drive (4WD) Switch Circuit Low". So, is my transfer case switch/sensor in need of replacing? Ever since I brought it I've gotten the part-time light on, even though it's in 2WD. I firgured the switch is the problem, since research brought it up as a common issue.

PS: I also have P1491, which I'm guessing means I need the radiator replay needs to be replaced, am I correct?

Thank you for your time!
:JEEPIN:
Author:  ahjjones [ Tue Feb 08, 2011 11:08 am ]
Post subject:  Re: Engine codes - P0838 & P0837. Is it my transfer case swi
25 views and no reply? Does anybody know?!
Author:  Liberty02sport [ Wed Feb 09, 2011 1:46 am ]
Post subject:  Re: Engine codes - P0838 & P0837. Is it my transfer case swi
Have you checked the 4WD linkage to make sure it's not out of adjustment and causing your sensor to trip the codes ?? If it isn't linage related then your probably right about the sensors needing replacement..Also what year is it ?? this might help get the answers you're looking for.
Author:  TheJawsOfDeath [ Thu Feb 17, 2011 1:05 am ]
Post subject:  Re: Engine codes - P0838 & P0837. Is it my transfer case swi
Those codes indicate a fault with the switch itself, not the external linkage. The sensor is a resistive multiplex switch meaning that each position has a corresponding, known resistance value. The selector plate in the transfer case moves the switch to a different position for each 4wd position. The PCM supplies a reference voltage and monitors the return side of the circuit to determine what mode the transfer case is in. There's probably an open circuit in the switch. If you want to check the switch to be sure, these are the resistance values.

Image

Actually those are for an NV231 in a 2006. I dont know what year and case model you have.
Author:  ahjjones [ Thu Feb 17, 2011 11:26 am ]
Post subject:  Re: Engine codes - P0838 & P0837. Is it my transfer case swi
Okay, so I DO need to replace the transfer case switch, correct?
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