I have this code, resets every time. Also have codes relating to DEF injection line heater (P20BA18, P20BA18, P20B913); resistance too high, voltage too low, open or short. I've tested the in tank heater, it activates whereas the line heater II does not have current when activated. I recently replaced Doser and line due to leaks. Cleaned and water sealed connectors with CRC electrical lube. Couple weeks later these codes show up. I've called Mercedes about warranty on line I bought, they require their tech diagnose before warranteeing the line. I know they will check any relays or fuses related to this heater. I do not have a wiring schematic to show me where they would be and the cover panels for fuses and such have no layout... Of course. Any help would

Tags: P154A00