Forum Discussion

Explorer II

Dec 08, 2014

Anyone having DEF fluid problems in a MB diesel RV?

During the first 12,000 miles on my 2014 RV with a MB diesel engine and a Sprinter chasis I have stopped in 5 different MB dealers while traveling with my wife and 2 dogs. The DEF fluid light comes on and tells me I have a certain amount of starts left even when the DEF tank is full! Along with that comes on a check engine light! We had no choice to drive to a MB Sprinter dealer in another state, wait in the lounge with 2 dogs, find a motel for that night or nights! Talk about stress! This has happened 5 times in 5 different states. Several times during the same trip! Anyone have the same problem. I have 2014 Thor Siesta with a MB 188 hp diesel engine. Help!

Class C

14 Replies

carringb
Explorer
Dec 09, 2014
Have you looked for nearby Freightliner service centers? They can service Sprinters too.
dave17352
Explorer
Dec 09, 2014
There unfortunately are way to many problems with the DEF systems. They just don't have them perfected yet. I have had my truck in the shop three times for DEF issues in less than 26k miles. The thing they shouldn't do is threaten to leave you stranded by not letting you start you vehicle, thats BS. I could go with limiting your speed to like 50 MPH but leaving you stranded is ridiculous.
precioustime
Explorer II
Dec 08, 2014
donn0128 wrote:
Bad or stale DEF can cause this. Where did you fill the DEF tank and how old was the fluid?
The DEF fluid was from various auto parts stores. It is a mechanical problem not a DEF fluid problem. Pumps have been changed, wires have been changed, computer specs have been changed-you name it!
donn0128
Explorer II
Dec 08, 2014
Bad or stale DEF can cause this. Where did you fill the DEF tank and how old was the fluid?