P0AE5Hybrid/EV Battery Precharge Contactor A Control Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0AE5 reports that the precharge function works electrically but does not deliver the expected result, so the controller judges the circuit implausible. Ford documents it in special service message SSM 47129: 2013-18 C-MAX and Fusion Hybrid and Energi models and the MKZ Hybrid may not start, with P0AE5 stored in the battery energy control module. When pinpoint tests show that the DC/DC converter, the cabin coolant heater or the A/C compressor has a low internal resistance on its high-voltage side, Ford replaces only that component, not the battery junction box. A load that drags the bus down keeps the precharge from reaching its target. Open, low and high driver faults are P0AE4, P0AE6 and P0AE7.
- What you may notice
- Vehicle does not start or become ready
- Red warning triangle or hybrid warning in the cluster
- Possible additional codes from the faulty high-voltage consumer
- Likely causes
- LikelyHigh-voltage consumer with low internal resistance (DC/DC converter, coolant heater, A/C compressor)
- PossiblePrecharge resistor degraded or wrong value
- RarePrecharge contactor responding slowly or with high contact resistance
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.