Skip the auto shop - Our mechanics make house calls

Q: 4x4 not working after many part replacements

asked by on

My 4x4 still isn’t working - I’ll explain… The GEM module has been changed, as well as the vacuum switch, selector switch, both relays, and I also checked the fuses. There’s still no power going to the switch and/or transfer case motor. Both the 4x4 light and the low range light come on when I start the truck. Is there another module behind the dash that I haven’t located that should also be replaced or is this a different problem?

The system would need to be tested for input and output controls from the GEM module. The GEM should also be setting a code for an internal problem. Once the codes are received, then a diagnosis can be done to locate the problem. If you need help gathering the codes, a technician from YourMechanic can inspect your car’s reduced power and assist with the appropriate repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. 4x4 not working after many part replacements

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Batteries at 13v go dead after trying to start it

You need to have the battery charged and load tested. A battery may hold 13 volts and as soon as a load is put on it drop below 9 volts when they are bad. If you want to have this...

Q: 4WD push button light not working.

Hi there. Check the fuses for the 4WD circuit and see if the fuse is blown. If the fuse is blown replace it and continue diagnosing the circuits to find out why the fuse blown. Remove the switch from the...

Q: Gas not getting to the throttle body

The problem could be a bad fuel pump, but I would start with checking the Inertia Cut Off Switch. This switch is in place to stop fuel delivery in the event of a collision, although they sometimes trip when you...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...