DEF head is or isn't?

[Rich W.]

Actually this may blow your theory up. One on the way home from Vegas with outside temps of 114. Other times perfect temps 70-80. The fill seems to answer the call though.

Yes, my observatios could well be coincidence, and/or it could be a weak or faulty level sensor (float) that gets stuck. But if it gets stuck above empty it should report that level and not “low DEF”, unless the ECM is also programmed to track a gradual reduction in the tank level. I’ll have to investigate that one.

 

[jagpot]

Yes, my observatios could well be coincidence, and/or it could be a weak or faulty level sensor (float) that gets stuck. But if it gets stuck above empty it should report that level and not “low DEF”, unless the ECM is also programmed to track a gradual reduction in the tank level. I’ll have to investigate that one.

Let me know what your research brings up. It certainly is worrisome.