P2DA9DC/AC Converter Control Module A Switch A Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2DA9 belongs to switch A of the DC/AC converter control module A, the inverter that supplies AC sockets in the vehicle. Unlike P2DA8 the circuit is intact, but the switch does not behave as expected: its signal sits between valid states, or the commanded state does not show up at the output. CARB 13 CCR 1968.2 describes this type of check as a rationality or functional test kept apart from circuit faults. Ford's patent US11043801B2 gives a practical example: the controller compares voltage ahead of and behind each socket switch and reports a switch error when voltage arrives upstream but not downstream. No manufacturer documents P2DA9 publicly. Worn or sticking contacts, a relay that does not pull in, contact resistance or a jammed button are typical; outlets then work only intermittently.
- What you may notice
- Outlets of group A work only intermittently
- Outlet power switches off unexpectedly under load
- Switch position in the display does not match the outlet state
- Likely causes
- LikelyWorn, sticking or burnt contacts of switch A or its relay
- PossibleHigh contact resistance in connector or outlet wiring
- PossibleOutlet button jammed by dirt or damage
- RareVoltage sensing in the converter module implausible
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.