P2AD5Intermediate System Voltage 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
- P2AD5 is the high counterpart: the intermediate voltage level, in current vehicles mostly a 48 V mild-hybrid network, rises above its permitted maximum. Overvoltage typically arises when the starter-generator regenerates harder than the battery can accept, for example with a full or cold 48 V battery, a battery that has disconnected itself internally, or a faulty regulator in the generator or DC/DC converter. No manufacturer publishes P2AD5 or its threshold, so the details are maker specific; the assignment to 48 V follows from the term and the spread of such networks since 2018. Connected modules may switch off to protect themselves, so recuperation, electric boost and start-stop drop out and the 12 V side may show warnings. Diagnosis starts with the battery management data and the charge command of the generator.
- What you may notice
- Warning message about the electrical system
- Recuperation, electric boost and start-stop unavailable
- Likely causes
- LikelyStarter-generator regulating the voltage too high
- Possible48 V battery disconnected internally or unable to accept charge
- RareFaulty DC/DC converter feeding back into the network
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.