Fault Family System: Powertrain (P-Codes) 11 SAE Codes

Battery Charger 14V Output Circuit

Diagnostic & Technical Explanation

Code P0D42 sets when the control module detects the onboard charger's auxiliary 14V output — the buck-converted supply the charger provides to the 12V system while plugged in — has fallen outside its regulated voltage window. The most common physical causes are a degraded output filter capacitor inside the charger that lets ripple through, a corroded output-wire connection at the 12V junction/fuse box, and an aging 12V accessory battery that pulls the regulated output down under load. Because this is the charger's low-voltage side, diagnosis and repair do not require opening the HV enclosure.

These 11 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 11 times.

Codes in this family (11)

Code	Definition	Repair coverage
P0D42	Battery Charger 14 Volt Output Voltage Sensor Circuit	3 ranked fixes
P0D43	Battery Charger 14 Volt Output Voltage Sensor Circuit Range/Performance	3 ranked fixes
P0D44	Battery Charger 14 Volt Output Voltage Sensor Circuit Low	3 ranked fixes
P0D45	Battery Charger 14 Volt Output Voltage Sensor Circuit High	3 ranked fixes
P0D46	Battery Charger 14 Volt Output Voltage Sensor Circuit Intermittent/Erratic	3 ranked fixes
P0D47	Battery Charger 14 Volt Output Current Sensor Circuit	3 ranked fixes
P0D48	Battery Charger 14 Volt Output Current Sensor Circuit Range/Performance	3 ranked fixes
P0D49	Battery Charger 14 Volt Output Current Sensor Circuit Low	3 ranked fixes
P0D4A	Battery Charger 14 Volt Output Current Sensor Circuit High	3 ranked fixes
P0D4B	Battery Charger 14 Volt Output Current Sensor Circuit Intermittent/Erratic	3 ranked fixes
P0D5B	Battery Charger 14 Volt Output Power 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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