Fault Family System: Powertrain (P-Codes) 4 SAE Codes

Reductant Pump Position Sensor

Diagnostic & Technical Explanation

Code P2AD6 (Reductant Pump Motor Position Sensor Circuit) covers the position sensor that confirms the diesel exhaust fluid supply pump's motor is actually rotating and pumping as commanded, distinct from the pump's own control-circuit fault codes. The ECM flags an open, shorted, out-of-range, or intermittent signal. Causes are a worn sensor element from continuous pump-motor rotation, a corroded connector at the pump module, or DEF crystallization fouling the sensor's mounting area after a cold soak.

These 4 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 4 times.

Codes in this family (4)

Code	Definition	Repair coverage
P2AD6	Reductant Pump Motor Position Sensor Circuit	3 ranked fixes
P2AD7	Reductant Pump Motor Position Sensor Circuit Range/Performance	3 ranked fixes
P2AD8	Reductant Pump Motor Position Sensor Circuit Low	3 ranked fixes
P2AD9	Reductant Pump Motor Position Sensor Circuit High	3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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