P207F: Ram reductant quality: compare fluid and scan-tool evidence

A quality code needs more than a fill guess

For this Ram diesel case, FCA asks technicians to collect both a refractometer concentration measurement and the concentration reported by the diagnostic system. Those are different observations. Comparing them can reveal whether the diagnostic picture agrees with the sampled fluid; the code alone is not a measured concentration and does not establish that a recent DEF purchase was contaminated.

Temperature and history change interpretation

The requested evidence also includes the concentration-sensor temperature, tank temperature and tank level when the fault occurred. Recent weather, fill history before and after the event, and a hydrocarbon reading are part of the record. These details preserve conditions that may be lost after a refill or repair. They should be collected before drawing a conclusion from a single current level display.

The note does not prescribe a tank replacement

All active and inactive powertrain codes and actions already taken should accompany the measurements. The historical document requests engineering review, then refers back to the P207F diagnostic tree; it does not publish a universal concentration acceptance range or declare the tank shell defective. Ask for the actual measurements and the diagnostic reason for any proposed component replacement. A successful repair should address the confirmed cause and reassess the relevant fault behavior, not merely dilute or top up the tank until the lamp disappears. Current service information governs the test method and acceptable results for the exact vehicle.

Source and applicability

FCA GPOP note dated March 16, 2016 concerns 2015–2016 Ram D2, DD, DJ and DP trucks with the 6.7 L Cummins diesel.

Manufacturer bulletin, page 1