Engine light code P21b0 Reductant Level Sensor C Circuit High
Cross-Country
Joined: Jan 2005
Posts: 62
Likes: 2
From: Red Bluff, CA
Went out to my truck with some DEF and opened the DEF cap heard a hissing sound as I opened it and then the check engine light disappeared and now everything is fine! I was in the mountains of Nevada for the last week for Halloween and the pressure must have built up in the DEF tank? Anyway I am glad that there isn't a circuit error anymore.
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lunchmeat
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mybigredford
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