In January I started getting air reservoir filling too slow codes. after some trouble shooting I noticed the air compressor was not running even with correct voltage. I ordered a rebuilt from roverlandparts.com and installed it. It took some time to get it to fill properly and re inflate the bags. Once I was done I started getting air reservoir filling too fast codes(only causes a light does not stop system from operating) so i didnt think much of it. a few days later i started getting fills too slow AND too fast codes AT THE SAME TIME. Now i get both codes each time I turn the truck on even though it works for the first few min I turn it on. I emailed the company I bought it from and was told Ill need to talk to a tech because the only issue they have had with their pumps is filling too slow due to failure out of the box. Is this something anyone has seen before?

 

Reservoir filling too slow is typically a compressor issue. It just can't put out enough volume to get the reservoir up to the proper pressure withing the given time frame. Of course there could be a leak somewhere as well.

As for the Reservoir filling too fast, I have not actually seen this code in person, but knowing how the system works, I suspect you may have a Reservoir block going bad (sticking). The reservoir block has a shut off valve that isolates the reservoir from the rest of the system. The pressure sensor is in that block, BEFORE the shutoff valve. Normally, when the compressor is trying to fill the reservoir, the valve is open, which means the block is pressurized as well as the sensor, the same time as the reservoir. If that valve gets stuck closed, the block will get pressurized very quickly, since none of that air is going to the reservoir.

 

That would make sense. My front sometimes will just deflate and always fills the slowest........crap

 

I've read that some people have removed the blocks and cleaned them, I don't know how. But it might be worth looking at. It sounds like sticky valve blocks.