Fault Family System: Powertrain (P-Codes) 3 SAE Codes

Control Module Wakeup Circuit

Diagnostic & Technical Explanation

Code P24EF (Control Module Wake-up Circuit/Open) sets when a control module's wake-up input, the signal that brings the module out of sleep mode when the vehicle is unlocked or another module requests network activity, reads open, shorted low, or shorted high. Causes are a failed wake-up relay or diode, a corroded connector at the module, or damaged wiring on the wake-up line shared with other body/network modules.

These 3 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 3 times.

Codes in this family (3)

Code	Definition	Repair coverage
P24EF	Control Module Wake-up Circuit/Open	3 ranked fixes
P24F0	Control Module Wake-up Circuit Low	3 ranked fixes
P24F1	Control Module Wake-up 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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