P2DCAStarter/Generator Excitation Current Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2DCA is set when the field current of a starter/generator with electrically excited rotor does not stay steady but drops out or jumps for short moments, without staying beyond the low or high limit long enough for P2DC8 or P2DC9. The rotor coil of a claw-pole machine such as Valeo's 48 V iBSG receives its current through brushes running on slip rings, so worn or sticking brushes and dirty or worn rings are typical sources of such dropouts; a loose plug on the field leads or a cracked solder joint in the excitation bridge can do the same. Each dropout briefly collapses the rotor field, making torque and charging current fluctuate. No manufacturer documents P2DCA publicly. Drivers may notice uneven engine restarts or a flickering charge warning. General fault: P2DC7.
- What you may notice
- Charge warning that comes and goes
- Jerky or delayed restarts after start-stop
- Electric boost and recuperation work only at times
- Likely causes
- LikelyWorn or sticking brushes, dirty or worn slip rings
- PossibleLoose connector or terminal on the field leads
- RareCracked solder joint in the excitation bridge of the controller
- 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 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.