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Old 06-09-2012, 04:03 PM
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DTC Code?

Hello I hope someone can help me figure out what this DTC code means that just popped up in my '02 Grand Cherokee. It's a 4.0L engine with the Selec-Trac NV 242 transfer case and the 42RE transmission. I just recently dropped the transmission pan changed the gasket, filter and oil about 4 months ago. Coming back from the store earlier today the engine raced to about 5500 RPM before switching into second gear. The DTC code that came up is P0837 and this is the explanition I found on wjjeeps.com

Four Wheel Drive (4WD) Switch Circuit Range/Performance

Four wheel drive (4WD) muxed switch input detected in invalid or irrational switch state (switch status provided to engine module from transfer case module during 4WD low gear engagements)

Does anyone know what this means, any help would be greatly appreciated.
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Old 06-09-2012, 04:48 PM
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Re: DTC Code?

It probably has to do with a faulty transfer case position sensor. I would start removing the connector of the T-case sensor and clean it with electrical contact cleaner. Attached some values for the different positions.
Attached Files
File Type: pdf T-case sensor.pdf (71.2 KB, 14 views)
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Old 06-11-2012, 09:14 PM
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Re: DTC Code?

Thanx so much for the info Frango. I sprayed the transfer case sensor with the electrical contact cleaner plugged it back in and drove it for the last 2 days without a problem. I hope thats all it was, thanx again.
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Old 06-12-2012, 09:57 AM
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Re: DTC Code?

Good to hear, keep'm rolling.
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