2019 with 2300 miles and a bad 4x4 actuator solenoid. No noticeable symptoms but was unable to have an on car tire balance due to locked hubs.
if you’re un familiar with the system, it uses vacuum to disengage the auto hubs. The system defaults to 4x4 locked hubs without vacuum. This is to ensure 4x4 works in a bad situation, however if the system fails it fails in locked mode. This will cause wear and tear to the hubs when driving in dry 2wd conditions.
I tested my system by turning the truck on in 2wd, in drive, parking brake on. i then lifted one front wheel and turned it by hand. Sure enough my axle turned as well. I dont have a fancy vacuum pump to test my system so I followed my lines looking for cuts. I pulled the line off the hub and didnt have any vacuum present. Above the brake booster there is a solenoid to switch to vacuum or atmosphere. I pulled the line coming from the intake and attached it to the lines from the hub. Sure enough, the hub unlocked and axles did not spin. I put a piece of tubing on the solenoid and it wouldn't allow the vacuum to go to the hubs. I have a solenoid on order, if that doesnt work off to the dealer. Anyways the tire shop said these things fail pretty regularly and to keep an eye on it. I thought i would share my experience with everyone here, I would of never thought about it if the shop didnt say anything.
if you’re un familiar with the system, it uses vacuum to disengage the auto hubs. The system defaults to 4x4 locked hubs without vacuum. This is to ensure 4x4 works in a bad situation, however if the system fails it fails in locked mode. This will cause wear and tear to the hubs when driving in dry 2wd conditions.
I tested my system by turning the truck on in 2wd, in drive, parking brake on. i then lifted one front wheel and turned it by hand. Sure enough my axle turned as well. I dont have a fancy vacuum pump to test my system so I followed my lines looking for cuts. I pulled the line off the hub and didnt have any vacuum present. Above the brake booster there is a solenoid to switch to vacuum or atmosphere. I pulled the line coming from the intake and attached it to the lines from the hub. Sure enough, the hub unlocked and axles did not spin. I put a piece of tubing on the solenoid and it wouldn't allow the vacuum to go to the hubs. I have a solenoid on order, if that doesnt work off to the dealer. Anyways the tire shop said these things fail pretty regularly and to keep an eye on it. I thought i would share my experience with everyone here, I would of never thought about it if the shop didnt say anything.