P2CD2Hybrid/EV Battery Pack M Deterioration
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2CD2 flags section M, the thirteenth part of a sectioned high-voltage battery, as degraded in capacity or power. Unlike sections J to L, M has no matching over-temperature code in the available code lists, so the thermal history of this section has to be read from general pack temperature data. No manufacturer publicly documents P2CD2, and no published battery is divided into thirteen individually rated groups; Audi's Q5 PHEV with eight groups is the largest series on record. For cell and sensor faults and for cell balancing, CARB asks for separate codes per smallest replaceable unit; balancing failures are reported under other codes. Drivers notice less electric range and weaker response in electric mode, and the warning lamp comes on.
- What you may notice
- Hybrid or engine warning lamp on
- Reduced electric-only range
- Sluggish response in electric mode
- Likely causes
- LikelySection M degraded by age and charge cycles
- PossibleLong standstill at low charge damaged cells of section M
- RareCell balancing of section M no longer working
- 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: €400 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.