P0AC0 on 2012-2018 Ford Focus (Electric) — Hybrid Battery Pack Current Sensor "A" Circuit Range/Performance
1 vehicles · 1 makes · $600-$3,000 repair
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Ford Focus · 2012–2018
On the battery-electric Focus, the high-voltage pack's main positive and negative contactors (relays) fail - either welding stuck closed or burning their contacts open. When a contactor faults, the on-board charger cannot close the HV circuit, so the car reports a charging fault, refuses to accept AC from either the 120V convenience cord or a 240V EVSE, and may throw HV isolation faults. Owners on the Focus Electric community have traced dead-charge conditions to burnt contactors in the upper pack, sometimes alongside coolant intrusion into the pack, and Ford also issued service information for HV packs that will not charge on the second-generation 120V charge cord.
Common Symptoms
- Vehicle will not charge on 120V or 240V
- Charge port light does not illuminate or flashes an error
- Stop Safely Now or high-voltage warning message
- Unlocking charge cord message on the display
- Loss of range or no propulsion
How to Fix
Diagnose with the HV pack DTCs before replacing the charge cord or the on-board charger - a stuck or open contactor sets specific battery energy control module codes. The repair is replacement of the affected contactor inside the HV battery pack, which requires a high-voltage-qualified technician (pack de-energizing, isolation testing, coolant loop handling). If the pack shows coolant intrusion, that leak must be repaired or the replacement contactor fails again. Also verify the EVSE and its charge-cord software level, since the factory second-generation 120V cord has its own no-charge service fix.
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Sources for this issue (3)
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P0AC0 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0AC0 mean?
P0AC0 stands for "Hybrid Battery Pack Current Sensor "A" Circuit Range/Performance." Hybrid battery pack current sensor 'A' signal is implausible or out of expected range relative to operating conditions.
What are the most common causes of P0AC0?
The most common causes of P0AC0 are: Drifting/failing current sensor, High-resistance connection, Wiring fault, BMS fault. The specific cause varies by vehicle.
How much does it cost to fix P0AC0?
Repair costs for P0AC0 range from $600 to $3,000, depending on the vehicle and root cause.
Which vehicles are affected by P0AC0?
Au7o has documented P0AC0 across 1 vehicle models from 1 manufacturers: Ford.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.