Fault Family System: Powertrain (P-Codes) 7 SAE Codes

Reductant Pump Heater Circuit

Diagnostic & Technical Explanation

Code P05ED (Reductant Heater Control Module Supply Voltage) sets when the SCR/aftertreatment module detects an open circuit, out-of-range voltage, or a performance fault while driving the reductant (DEF) supply pump or its heater, both used to keep urea solution flowing and unfrozen for SCR NOx reduction. Causes are a failed pump motor, crystallized urea fouling the pump/heater, a corroded connector, or damaged wiring in the tank module.

These 7 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 7 times.

Codes in this family (7)

Code	Definition	Repair coverage
P05ED	Reductant Heater Control Module Supply Voltage	3 ranked fixes
P05EE	Reductant Pump Supply Voltage Circuit/Open	3 ranked fixes
P05EF	Reductant Pump Supply Voltage Circuit Low	3 ranked fixes
P05F0	Reductant Pump Supply Voltage Circuit High	3 ranked fixes
P05F1	Reductant Pump Supply Voltage Circuit Stuck On	3 ranked fixes
P05F2	Reductant Pump Supply Voltage Circuit Stuck Off	3 ranked fixes
P05F8	Reductant Heater Control Module Performance	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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