Fault Family System: Powertrain (P-Codes) 5 SAE Codes

ECM Power Input Signal

Diagnostic & Technical Explanation

Code P2505 (ECM/PCM Power Input Signal) sets when the ECM's own internal monitor finds its main battery power input signal open, out of range, or intermittent, separate from the power relay control circuit that switches it. Causes are a corroded main power connector at the ECM, a blown fuse or fusible link, or chafed power-feed wiring between the battery/junction box and the module.

These 5 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 5 times.

Codes in this family (5)

Code	Definition	Repair coverage
P2505	ECM/PCM Power Input Signal	3 ranked fixes
P2506	ECM/PCM Power Input Signal Range/Performance	3 ranked fixes
P2507	ECM/PCM Power Input Signal Low	3 ranked fixes
P2508	ECM/PCM Power Input Signal High	3 ranked fixes
P2509	ECM/PCM Power Input Signal Intermittent	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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