P0A0AHigh Voltage System Interlock Circuit A
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- The high-voltage interlock loop (HVIL) is a low-voltage signal loop routed through every HV connector, the service disconnect and component covers. If it opens, the control module opens the main contactors so no one can touch live parts. P0A0A is the general circuit fault on loop A. Stellantis sets P0A0A-00 on the Jeep Wrangler and Grand Cherokee 4xe when an HV connector is torqued but not fully seated after repair, and on the 2024-2025 Pacifica Hybrid it was traced to battery pack control module software; there the car will not start on either power source. Mercedes logs P0A0A00 in the DC converter of model line 243. CARB counts the HVIL as a safety-only system, so MIL behaviour varies. Low, high, performance and intermittent faults use P0A0B to P0A0E.
- What you may notice
- Vehicle will not start or go into ready mode
- Check engine and hybrid system warning on
- High-voltage system switched off while the 12 V system still works
- Likely causes
- LikelyHV connector or service disconnect not fully seated after repair
- PossibleSpread, bent or corroded interlock pins or damaged connector seals
- PossibleInterlock wiring chafed or cut
- RareBattery pack control module software fault (Chrysler Pacifica Hybrid 2024-2025)
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.