steve r

You are right sir so many electronics on these things have a couple newer Freightliners also every time it rains something goes wrong.

In Enfield from what I understand the grade gripper is on auto trannys it is tied into the ABS system the tranny and air system like you this is to new a unit for me to understand.

Thank you for the reply I came across an article showing the plastic vent on the bottom of the grade gripper solenoid. It says it can get wet and freeze this would make the brakes not release. Truck just got back to yard the plastic vent was froze over . Cleaned and reinstalled hand tight if and when it acts up again will unscrew it and see if that does it Will follow up if it works or not Thank you

Have a 2016 CHU when its been wet from rain the ABS and ATC lights will come on the code Im getting is for the ABS left 2nd axle wheel . When its below freezing the grade gripper sticks even when you have the switch disengaged . I have changed the grade gripper solenoid but it is still doing it. This dosnt happen all the time but when it does its always cold and wet. I have put my foot under the brake pedal and picked up on it and it has released not sure if it was coincidence its not sticking enough times for me to see if the problem is in the foot valve When it is stuck the brake lights are not on dont know if that rules out stuck brake pedal. Any ideas Thanks

Thankyou gentleman that was it , never even seen the fuse when first checked its a mini fuse on the top all the other fuses which are the taller circuit breaker style .And yes it is the fuse panel near clutch pedal , on the right side very top spot

Thankyou for quick reply I will recheck the fuses tomorrow also I didn’t know how many volts they called for will let you know thanks

2016 Mack CHU MP-8 The engine shut down light is on the truck runs fine it doesn't shut down .Engine fan is fully engaged getting codes 4812 4813 and 647 Changed both solenoids on oil filer housing wires look good getting 2.5 volts to both solenoids key on truck off. I did notice when i picked the truck up the engine oil temp gauge was going up and down while driving back to shop haven't run it long enough since changing the solenoids to know if that stopped . Still have same codes and shut down light is on any thoughts?