TechnicianVision · Knowledge base
High-Voltage Vehicle Research Tips: FCA/Stellantis Low-Voltage Battery Disconnection
I-CAR · July 24, 2026 · Chrysler, Dodge, Jeep, RAM, Fiat, Alfa Romeo, Stellantis
Summary
This article highlights the critical safety requirements for disconnecting the low-voltage (12V) battery on FCA/Stellantis high-voltage vehicles, where the Integrated Dual Charging Module (IDCM) can periodically wake the HV system. It emphasizes that procedures are model-specific, requiring unique steps such as fuse removal on a Jeep Wrangler 4xE or multimeter verification on a Dodge Hornet R/T.
What to do on the job
Always research and follow the model-specific '12-Volt Power Down' procedure in the OEM service manual under Service Information > 08-Electrical > 8F-Engine Systems > Battery System > Standard Procedure before disconnecting the low-voltage battery on any FCA/Stellantis HV vehicle.
How to use it
Use this document to justify additional labor time on estimates for EV/PHEV battery disconnects. It proves that disconnecting a 12V battery on modern FCA/Stellantis hybrid and electric vehicles is not a standard mechanical operation, but a safety-critical procedure requiring specific OEM steps, fuse removal, or multimeter verification to ensure the high-voltage relays are fully disengaged.
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