4 wheel drive not engaging
Posting Guru
Joined: Jul 2005
Posts: 1,006
Likes: 0
From: San Jose, CA
I haven't tried using 4WD mode in a while, but I'm pulling 2 codes:
P1876 Transfer Case 2-Wheel Drive Solenoid Circuit Failure
P1832 Transfer Case Differential Lock-Up Solenoid Circuit Failure
sigh..
P1876 Transfer Case 2-Wheel Drive Solenoid Circuit Failure
P1832 Transfer Case Differential Lock-Up Solenoid Circuit Failure
sigh..
Junior User
Joined: Jan 2008
Posts: 66
Likes: 1
From: La Habra, CA
when 4WD fails to work, try manually engaging the hubs. If that worked, then its a vacuum problem to the hub solenoid or the solenoid itself. I had this problem and it was the solenoid (part # tC3Z9H465A).
Posting Guru
Joined: Jul 2005
Posts: 1,006
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From: San Jose, CA
I'll look at it this coming weekend, but how much did that set you back? How did it fail? I started reading some docs and the first thing they suggest was the wiring or burned contacts on the solenoid circuit
Junior User
Joined: Jan 2008
Posts: 66
Likes: 1
From: La Habra, CA
Aquaman, my reply probably does not apply to your problem, since your truck threw codes indicating a transfer case issue. I was replying to the original poster. My issue was fixed with extended warranty. I had the same issue with my 2003 F250, also fixed with warranty.
BTW it's easy to lock hubs manually so its a good thing to try if 4WD fails to engage. BTW I had just driven onto the sand at Pismo (with 4WD engaged, I thought) when I got stuck. Very embarrassing. I started digging out when I thought about manually locking hubs and when I did the truck, thankfully, moved on with no problem.
BTW it's easy to lock hubs manually so its a good thing to try if 4WD fails to engage. BTW I had just driven onto the sand at Pismo (with 4WD engaged, I thought) when I got stuck. Very embarrassing. I started digging out when I thought about manually locking hubs and when I did the truck, thankfully, moved on with no problem.
Junior User
Joined: Feb 2009
Posts: 50
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From: Missouri
I turned the hubs to LOCK and both axles were powered in HIGH and LOW
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Posting Guru
Joined: Jul 2005
Posts: 1,006
Likes: 0
From: San Jose, CA
Just an update from my end... I went through the checklist of stuff in the repair manual.
First test was to see if the solenoid valve works by grounding the left-most and right-most connector pins while the ignition was on. Yup, the valve clicks each time and the vacuum pump in front of the driverside firewall started pumping as long as I had it grounded (valve open). Does that mean a vacuum leak?
Connections appear all good, but I must be blind or I can't find the 4x4 control box to test the connections between it and the valve...
First test was to see if the solenoid valve works by grounding the left-most and right-most connector pins while the ignition was on. Yup, the valve clicks each time and the vacuum pump in front of the driverside firewall started pumping as long as I had it grounded (valve open). Does that mean a vacuum leak?
Connections appear all good, but I must be blind or I can't find the 4x4 control box to test the connections between it and the valve...
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