System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Exhaust Aftertreatment Power Relay Circuit
Code P05F3: Exhaust Aftertreatment Power Relay Control Circuit/Open
Diagnostic & Technical Explanation
Code P05F3 (Exhaust Aftertreatment Power Relay Control Circuit/Open) sets when the ECM detects an open circuit, out-of-range voltage, or a stuck-on/stuck-off condition while driving the power relay that keeps the aftertreatment (SCR/DPF) control module powered after key-off to complete regeneration or dosing shutdown sequences. Causes are a failed relay, a blown fuse, or damaged control/power wiring.
First-listed procedure
Rank #1
Check aftertreatment relay and fuse
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 3 procedure(s) are in the licensed dataset. Ordering context.
Full family: Exhaust Aftertreatment Power Relay Circuit
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)