P0E57DC/DC Converter Input Voltage Too High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0E57 is set when the DC/DC converter sees more voltage on its input than it is rated for. Excess input voltage stresses the switching transistors and input capacitors, so a converter typically stops working to protect itself. No manufacturer documents P0E57 on an official public server. Supplier data show the limits involved: Poclain specifies 96 V as the highest continuous input for its 48 V converter. Ford's hybrid summaries treat a comparable overvoltage on the inverter side as P0C79, triggered when the DC bus measurement exceeds 516 V for 10 ms. CARB requires such hybrid components to be monitored. Typical triggers are a boost stage regulating too high, a charging or regenerative event without proper voltage control, or a faulty voltage measurement. The 12 V supply may stop while the code is active.
- What you may notice
- Hybrid system or 12 V battery warning
- Converter switches off temporarily, 12 V voltage drops
- Reduced power or limited regeneration
- Likely causes
- PossibleHigh-voltage bus driven too high by boost stage, regeneration or charging
- PossibleInput voltage measurement in the converter reads too high
- RareHybrid or battery control software needs an update
- 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: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.