1999 GMC Savana G 1500 passenger van

Asked by May 20, 2015 at 12:46 AM about the 1999 GMC Savana G1500 Passenger Van

Question type: Maintenance & Repair

put 3 transmissions in and still getting P1840 code. Changed valve body and sensors.
Using dexron 6 transmision fluid

3 Answers

435

P1840 - Transmission Transfer Case Shift Motor Short Circuit To Battery Read more: http://engine-codes.com/p1840.html#ixzz3ae07ZuDs

435

Check for possible pinched wiring causing short/ also ohm read transfer case shift moter resistance. That value can be obtained by anyone who has transmission diagnostic software.

78,375

That code is not viable for your rig, you have no transfer case shift motor. Something else could be causing the erroneous code, as Tooloose stated check the wiring, a faulty sensor ground can cause all kinds of crazy codes.

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