2018 TIFFIN ALLEGRO — Problems, Recalls & Safety Data

RV Diesel Exhaust Fuel (DEF Head) Sensor failure. These failure rendered our RV drivability limited and us stranded at Cummins dealerships, once in 2019 and again in 2020. We have been full time RV'ers and rely on motorhome getting us from place to place. We were lucky to not have the engine derate while driving, but had to pull over on the freeway, there were no off ramps or rest stops for miles as multiple warning lights and codes flashed on the dash so we could call Tiffin to ask for help, what to do and where to go. We where able to get to a Cummins dealer to have it fixed. We were warned to drive slow and straight to the Cummins dealership before the engine derated. RV Diesel Exhaust Fuel Sensor failures have been occurring & re-occurring at an astronomical rate across the country, we firmly believe that RV's should be exempt from requiring DEF / DEF Sensors, period. Please do not wait until there is a FATALITY, OR POSSIBLE GREATER FATALITIES before making this change retroactive for all RV's nationally. The Cummins dealerships and Tiffin have the repair records. The error codes we received was SPM 3521 FMI 11 error code. Looking it up it is "After treatment 1 Diesel Exhaust Fluid Property". Also SPN 3364-9, ECM 1761-9, ECM 3031-9, SPN 3364-9 and ECM 3031-9 showed up.

WHEEL SPEED SENSORS WENT OUT,AND WENT INTO LIMP MOOD,TRANSMISSION WOULD NOT, SHIFT,LIGHTS CAME ON DASH,ABS,CHECK ENGINE LIGHT,AND MOORE. THIS WAS ON A INTERSTATE,GOOD WAY TO GET RUN OVER. WE ARE IN A REV CLUB THERE IS A LOT OF THIS GOING ON.

WHEEL SPEED SENSORS WENT OUT,AND WENT INTO LIMP MOOD,TRANSMISSION WOULD NOT, SHIFT,LIGHTS CAME ON DASH,ABS,CHECK ENGINE LIGHT,AND MOORE. THIS WAS ON A INTERSTATE,GOOD WAY TO GET RUN OVER. WE ARE IN A REV CLUB THERE IS A LOT OF THIS GOING ON.

ENTRY DOOR LATCH ON OUR TIFFIN 2018 ALLEGRO BUS UNLATCHED AS WE WERE IN MOTION ON A HIGHWAY

TL* THE CONTACT OWNS A 2018 TIFFIN ALLEGRO HITCHED TO A FREIGHTLINER CHASSIS. THE CONTACT STATED THAT WHILE DRIVING DOWN AN INCLINE, THE EXHAUST BRAKE SYSTEM ACTIVATED CAUSING THE BRAKE LIGHTS TO THE FREIGHTLINER CHASSIS TO ACTIVATE. AS A RESULT, THE BRAKE LIGHTS REMAINED ACTIVATE ON THE RV AS WELL AND THE CONTACT WAS CONCERNED THAT THAT THEY WOULD OVERHEAT DURING THE SIXTEEN MILE DOWNHILL DRIVE. THE CONTACT MENTIONED THAT ONLY THE TOWED VEHICLES BRAKE LIGHTS SHOULD ILLUMINATE AND THAT THE BRAKES SHOULD ONLY ACTIVATE WHEN THE BRAKE PEDAL WAS DEPRESSED. THE VEHICLE WAS TAKEN TO FREIGHTLINER DEALER: M & M COACH AT 5787 MCCULLY ST, CHINO, CA 91710 WHERE THEY ATTEMPTED TO TURN OFF THE BRAKES LIGHTS BUT FAILED. THE FREIGHTLINER MANUFACTURER WAS NOTIFIED OF THE FAILURE WHERE THEY INFORMED THE CONTACT THAT THE MULTIPLEX SYSTEM WAS PROGRAMMED WHERE THE BRAKE LIGHTS REMAIN ILLUMINATED WHEN THE EXHAUST BRAKE SYSTEM WAS ACTIVATED. THE APPROXIMATE FAILURE MILEAGE WAS 6,400. NO FURTHER INFORMATION WAS AVAILABLE FOR THE FREIGHTLINER CHASSIS.