Fault Family System: Powertrain (P-Codes) 8 SAE Codes

Aftertreatment Glow Plug

Diagnostic & Technical Explanation

Code P269B (Exhaust Aftertreatment Glow Plug Control Circuit/Open) covers the ignition glow plug in a diesel exhaust burner (fuel-fired aftertreatment heater) that lights injected fuel to raise DPF temperature for regeneration, flagging an open, shorted, or underperforming plug element or its control circuit. Unlike engine glow plugs, this plug lives in the exhaust stream and fails from soot fouling and thermal cycling; a failed control relay and heat-damaged supply wiring are the other common causes.

These 8 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 8 times.

Codes in this family (8)

Code	Definition	Repair coverage
P269B	Exhaust Aftertreatment Glow Plug Control Circuit/Open	3 ranked fixes
P269C	Exhaust Aftertreatment Glow Plug Control Performance	3 ranked fixes
P269D	Exhaust Aftertreatment Glow Plug Control Circuit Low	3 ranked fixes
P269E	Exhaust Aftertreatment Glow Plug Control Circuit High	3 ranked fixes
P269F	Exhaust Aftertreatment Glow Plug Circuit/Open	3 ranked fixes
P26A0	Exhaust Aftertreatment Glow Plug Performance	3 ranked fixes
P26A1	Exhaust Aftertreatment Glow Plug Circuit Low	3 ranked fixes
P26A2	Exhaust Aftertreatment Glow Plug 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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