How to Troubleshoot and Fix F150 4X4 1997-2003
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2-wheel drive solenoid (pictured location) 03 F-250 6.0l SD 4x4
Hi I have a DTC P 1876 on my F-250 and I can’t find the location where the solenoid is. I have read on the forum where they say it is. But there is nothing that even resembles anything like the sensor. Is it under a plate or cover? I want to replace it & have the replacement solenoid. Can someone please show either where in the shop manual it is or a “Picture of its physical location on the transfer case”?
thanks
thanks
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Did you figure it out
HELLO REVYTRUCKS,
I KNOW THIS IS AN OLD POST, HOWEVER IT FOUND IT VERY INFORMATIVE AND STRAIGHT TO THE POINT! HOWEVER, AFTER CHECKING EVERYTHING, I AM STILL HAVING THE SAME PROBLEM: FRONT 4WD IS NOT ENGAGING. HERE IS WHAT I HAVE CHECKED: 1) FUSE #23 IS GOOD. 2) 4X4 & LOW RANGE LIGHT COMES ON AND I CAN HEAR THE CLICKING BEHIND THE DASHBOARD. 3) WHEN "ENGAGED," THE FRONT DRIVESHAFT TURNS (SO I KNOW MY TRANSFER CASE AND TRANSFER CASE SWITCH IS WORKING), 4) BOTH SOLENOIDS IS WORKING (CAN HEAR AND FEEL THE CLICKING AFTER TURNING ON AND OFF THE 4X4; ALTHOUGH I WAS NOT ABLE TO CHECK THE VOLTAGE DUE TO NOT HAVING RIGHT TOOL). 5) CHECK BOTH VACUUM HOSES FOR ANY WEAR/TEAR BUT FOUND NO LEAKS, 6) BOTH VACUUM HOSES HAVE EQUAL SUCTION AT THE VACUUM ACTUATOR. 7) THE VACUUM ACTUATOR IS WORKING FINE AND DIAPHRAGM MOVES SMOOTHLY (I TRIED MOVING THE LEVER WITH HAND AND THEN BACK IN; WORKS FINE). 8) AND THE SHIFT FORK IS NOT BENT.
IN YOUR POST YOU ALSO RECOMMENDED THAT IT MIGHT BE AN ISSUE WITH FRONT DIFFERENTIAL, HOWEVER WHEN TURNING STEERING WHEEL THERE IS NO NOISES OR RACKING AS SUCH
. I HAVE A 4X4 MECHANIC IN TOWN WHO I WENT BY FOR MORE ADVICE, HOWEVER AFTER EXPLAINING THE STEPS THAT YOU PROVIDED THEY ARE ADVISING ME THAT IT MIGHT BE AN ISSUE WITH THE TRANSFER CASE. MY RESPONSE WAS THAT MY FRONT DRIVESHAFT WAS TURNING SO IT COULDNT BE THE TRANSFER CASE. SO THEY RECOMMENDED THAT I TAKE IT IN ON MONDAY (JULY 22, 2013) SO THAT THEY CAN GIVE MY TRUCK AN "GENERAL 4X4 CHECK UP" (AT NO COST, HOWEVER IF WILL CHARGE $150 IF THEY NEED TO DROP THE TRANSFER CASE 
)
PLEASE PLEASE PPPPPPLEAASE HELP ME
. IVE SEARCHING MANY FORUMS, HOWEVER FOUND YOURS TO BEST EXPLAIN HOW TO TROUBLESHOOT.
ANY OTHER RECOMMENDATIONS OR ADVICE? ANY WOULD BE GREATLY APPRECIATED!!
THANKS IN ADVANCE
I KNOW THIS IS AN OLD POST, HOWEVER IT FOUND IT VERY INFORMATIVE AND STRAIGHT TO THE POINT! HOWEVER, AFTER CHECKING EVERYTHING, I AM STILL HAVING THE SAME PROBLEM: FRONT 4WD IS NOT ENGAGING. HERE IS WHAT I HAVE CHECKED: 1) FUSE #23 IS GOOD. 2) 4X4 & LOW RANGE LIGHT COMES ON AND I CAN HEAR THE CLICKING BEHIND THE DASHBOARD. 3) WHEN "ENGAGED," THE FRONT DRIVESHAFT TURNS (SO I KNOW MY TRANSFER CASE AND TRANSFER CASE SWITCH IS WORKING), 4) BOTH SOLENOIDS IS WORKING (CAN HEAR AND FEEL THE CLICKING AFTER TURNING ON AND OFF THE 4X4; ALTHOUGH I WAS NOT ABLE TO CHECK THE VOLTAGE DUE TO NOT HAVING RIGHT TOOL). 5) CHECK BOTH VACUUM HOSES FOR ANY WEAR/TEAR BUT FOUND NO LEAKS, 6) BOTH VACUUM HOSES HAVE EQUAL SUCTION AT THE VACUUM ACTUATOR. 7) THE VACUUM ACTUATOR IS WORKING FINE AND DIAPHRAGM MOVES SMOOTHLY (I TRIED MOVING THE LEVER WITH HAND AND THEN BACK IN; WORKS FINE). 8) AND THE SHIFT FORK IS NOT BENT.
IN YOUR POST YOU ALSO RECOMMENDED THAT IT MIGHT BE AN ISSUE WITH FRONT DIFFERENTIAL, HOWEVER WHEN TURNING STEERING WHEEL THERE IS NO NOISES OR RACKING AS SUCH
. I HAVE A 4X4 MECHANIC IN TOWN WHO I WENT BY FOR MORE ADVICE, HOWEVER AFTER EXPLAINING THE STEPS THAT YOU PROVIDED THEY ARE ADVISING ME THAT IT MIGHT BE AN ISSUE WITH THE TRANSFER CASE. MY RESPONSE WAS THAT MY FRONT DRIVESHAFT WAS TURNING SO IT COULDNT BE THE TRANSFER CASE. SO THEY RECOMMENDED THAT I TAKE IT IN ON MONDAY (JULY 22, 2013) SO THAT THEY CAN GIVE MY TRUCK AN "GENERAL 4X4 CHECK UP" (AT NO COST, HOWEVER IF WILL CHARGE $150 IF THEY NEED TO DROP THE TRANSFER CASE )PLEASE PLEASE PPPPPPLEAASE HELP ME
. IVE SEARCHING MANY FORUMS, HOWEVER FOUND YOURS TO BEST EXPLAIN HOW TO TROUBLESHOOT.ANY OTHER RECOMMENDATIONS OR ADVICE? ANY WOULD BE GREATLY APPRECIATED!!
THANKS IN ADVANCE
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Joined: May 2021
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From: North Eastern Arizona
97 F250 LD w/ 4wd - GEM modules and Other trouble shooting
Along this same thread - does anybody know if a GEM has to be reprogrammed?
The 4wd drive on my '97 F250 LD with ESOF quit working last October. It's been in two different shops since then and it is still not working. The first shop diagnosed the problem as the GEM. 2 different GEMs later, then a second shop, still no 4wd. I ordered a nearly identical GEM from a shop on ebay - installed it - still no 4wd. One difference I have noted is the replacement GEM does not "click" on startup (6 clicks) as the original GEM did. It is as if the GEM doesn't know the vehicle has 4wd. Hence the question - Does a GEM need to be programmed to the vehicle?
BTW, I'm now looking at the transfer case motor. If it is bad, then the GEM would quit trying to make it work and the front hubs would not even bother to try to engage. However, I didn't get a code for a bad transfer case motor.
Any ideas - would be appreciated.
Jim
The 4wd drive on my '97 F250 LD with ESOF quit working last October. It's been in two different shops since then and it is still not working. The first shop diagnosed the problem as the GEM. 2 different GEMs later, then a second shop, still no 4wd. I ordered a nearly identical GEM from a shop on ebay - installed it - still no 4wd. One difference I have noted is the replacement GEM does not "click" on startup (6 clicks) as the original GEM did. It is as if the GEM doesn't know the vehicle has 4wd. Hence the question - Does a GEM need to be programmed to the vehicle?
BTW, I'm now looking at the transfer case motor. If it is bad, then the GEM would quit trying to make it work and the front hubs would not even bother to try to engage. However, I didn't get a code for a bad transfer case motor.
Any ideas - would be appreciated.
Jim
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my name is nathan mtz and i've been having a huge problem with my 2003 ford f150 truck my 4x4 sounds like its not engaging but yet my front 2 tires spin and my lights and vacuum lines work perfectly i already did some tests here and their but i hardly ever have time to fix it properly it sounds like it’s popping or grinding where my transfer case is at some one already told me that might be my problem please help me before i spend a lot of time and money on something that could be so simple and easy to fix i already changed my cv joints and frount end suspension along with tie rods, uper and lower ball joints control arms even my hubs?! idk what else to do thank you
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Joined: Nov 2020
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From: york PA
4x4 problems
Good afternoon
I have a 1999 F150 extended cab 4.6 l XLT My problem is it goes in 4 wheel drive fine but when I drive about 20 10 miles per hour it starts bucking and pulling to the right And the only way I can get it out of 4 wheel drive is I put it in reverse and go backwards and it unlocks. My 2nd problem is I'd like to change out the automatic hubs to manual hubs but I don't know what Dana Axel I have or the spine number.
I have a 1999 F150 extended cab 4.6 l XLT My problem is it goes in 4 wheel drive fine but when I drive about 20 10 miles per hour it starts bucking and pulling to the right And the only way I can get it out of 4 wheel drive is I put it in reverse and go backwards and it unlocks. My 2nd problem is I'd like to change out the automatic hubs to manual hubs but I don't know what Dana Axel I have or the spine number.
1st Gear
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Hey there! I have a 1997 ext cab 4.6 xlt. I noticed that when 4x4 engages (just that, not low) i can just go straight ahead, i cant turn, or i hear like a grinding noise, dirving just forward no curves it is clearly (at least i think engaged and good), but if i try to take a turn at any speed, also when i leave a parking lot after a stop, it starts to kind of grind. i remove the 4x4 and in 4x2 no noise all good right away.
Any idea?
Any idea?
1st Gear
Joined: Feb 2026
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F150 98 4x4 help
Hey I'm in the same boat I have an F-150 four-wheel drive not working. 1998
I'm in the process of trying to find the wire diagrams today
I checked the switch I wasn't getting power to all four wires but the middle at about 5.4 volts. If you switch the switch the voltage changes so that must be a adjustment signal.
I went to go check fuses all fuses look good in the cab and under the hood.
So I grabbed my power probe and no I'm not talking about a voltmeter I'm talking about a power probe where you can give power and ground. And I gave power 12v to the blue/striped orange wire the switch would light up and I can turn my four-wheel drive off and on.
So I was trying to find the so-called gem relay. Found it behind the cluster. Of course I can't have it plugged then check the wire harness and back probe the blue and orange wire as there's no clearance behind the cluster to get my power probe back there.
I'm just wondering if the gem sends the signal to the switch or will it go through another fuse before going to the switch? Or relay? Before I start throwing money at it and buying a new gem.
I'm in the process of trying to find the wire diagrams today
I checked the switch I wasn't getting power to all four wires but the middle at about 5.4 volts. If you switch the switch the voltage changes so that must be a adjustment signal.
I went to go check fuses all fuses look good in the cab and under the hood.
So I grabbed my power probe and no I'm not talking about a voltmeter I'm talking about a power probe where you can give power and ground. And I gave power 12v to the blue/striped orange wire the switch would light up and I can turn my four-wheel drive off and on.
So I was trying to find the so-called gem relay. Found it behind the cluster. Of course I can't have it plugged then check the wire harness and back probe the blue and orange wire as there's no clearance behind the cluster to get my power probe back there.
I'm just wondering if the gem sends the signal to the switch or will it go through another fuse before going to the switch? Or relay? Before I start throwing money at it and buying a new gem.
Last edited by firebirdgta88; Feb 17, 2026 at 03:38 PM.
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