Powertrain, generic · Hybrid propulsion

P0CA7 Hybrid/EV Battery Discharging Current High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0CA7 is set when more current flows out of the hybrid or EV battery than the controller allows. Audi documents it on 48 V mild hybrids (A6, A7, A8, later also Q7, Q8 and S/RS versions, 2018 to 2024): the battery management of the 48 V battery, J1120, stores P0CA700 as discharge current too high, often with U046900 in the engine module, and the cluster shows an electrical system warning. Audi's 2020 bulletin 2058831/1 fixes it with new software for the belt starter generator; revision 9 from 2023 adds a hardware test of that generator. Stellantis lists P0CA7-00 in bulletin 08-054-22 for the 2021 Wrangler 4xe among codes that light the MIL falsely and are cured by a battery pack control module flash. P0CA6 covers the charging direction.

Likely causes

Starter/generator or battery module software (Audi 2058831, Stellantis 08-054-22)
Belt starter generator drawing excessive current
Battery current sensor or battery management misreading

Symptoms

  • Electrical system or battery warning in the cluster
  • Start-stop or electric assistance temporarily unavailable
  • Check-engine lamp on plug-in hybrids

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–2,000
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv batterybms

Related codes

P0CA6P0CA5P0ABFP0AC0P0AFA

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.