Originally Posted by fcurci
So I set out this morning from a campground to go home, turned on my rig and my check engine light came in due to low DEF. I knew I had nearly three quarters full, but when I looked at the guage it was totally blank. All other gauges on the dash we’re working properly. I had extra DEF with me put it in and no difference (wanted to make sure it didn’t leak out) I had to get home and thinking that the problem was only a bad connection I went home . I traveled am the way home at normal highway speeds without incident. I assume this is a problem I need to take to a chassis house. Has anyone had a similar issue and would it be safe to drive as long as I know I have DEF but do not have a gauge?
I drive a 2022 Tiffin Allegro Bus 45 OPP.
We just had ours fail last week. Tiffin overnight Gen 7 DEF sensor. Back on the road now.
Fault Codes 3868, 4572 and 4677 Caused by Diesel Exhaust Fluid (DEF) Header Malfunction
Light on: clock starts ticking
First hour nothing happens
25% de-rate next two hours
40% de-rate on fourth hour
Will run at 40% until one of three items occur:
The best option for customers caught in this situation is to not do any of the three things he has mentioned:
1. Do not turn the ignition off. *Leave the engine running until you get to a safe destination.
2. Do not let the engine idle for more than an hour.
4. Do not buy/add diesel fuel to the fuel tank, if you have to keep it running
In addition to the MIL and check engine light come on 5 miles before our exit the STOP engine light and buzzer was going off! The DEF logo on the dash was also Amber.
I kept driving until we arrived at the campground and set the engine in high idle while checking in. Drove to the site and got set up then contacted Tiffin. They could not have been better. Matt overnight us the part and arranged for a mobile mechanic to make the repair. Very happy with Tiffin on this one!!