P0CA4 on Audi
Hybrid / High-Voltage Battery Charging Voltage Too High
P0CA4 on Audi vehicles indicates hybrid / high-voltage battery charging voltage too high. Au7o has documented this code across 1 Audi model — most commonly on e-tron. The onboard charger control module has measured a charging voltage above the permitted limit for the high-voltage battery and aborts or refuses the charging session to protect the pack. Audi TSBs 2061788 and 2062631 list DTC P0CA400 ("Hybrid/high voltage battery load voltage too high") among the codes stored in high-voltage battery charger J1050 on 2020-2021 e-tron quattro and e-tron Sportback that are attributable to old onboard-charger software (level 0070) rather than to failed charging hardware.
Common Causes of P0CA4
- •Outdated onboard-charger software - Audi documents software 0070 as producing this and other "ghost" DTCs (TSB 2061788 / 2062631)
- •Charging station delivering out-of-spec voltage
- •Faulty voltage measurement inside the onboard charger
- •High-voltage battery management or contactor fault
P0CA4 on Audi by Model
Audi e-tron(1 issue)
- 2021 e-tron Charging Interruptions with Onboard-Charger Software 0070 - Diagnosis Required2021
Audi TSB 2061788/2 covers model-year 2021 e-tron quattro and e-tron Sportback vehicles with specified AC/DC charging interruptions, charging-flap operation problems, or an app request for auxiliary heating that does not pre-heat the vehicle when matching DTCs are stored in high-voltage battery charger control module J1050. Audi attributes the documented condition to onboard-charger software and identifies old software level 0070, not a proven failed charger module.
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View P0CA4 across all makes →Frequently Asked Questions
What does P0CA4 mean on Audi?▼
P0CA4 stands for "Hybrid / High-Voltage Battery Charging Voltage Too High." The onboard charger control module has measured a charging voltage above the permitted limit for the high-voltage battery and aborts or refuses the charging session to protect the pack. Audi TSBs 2061788 and 2062631 list DTC P0CA400 ("Hybrid/high voltage battery load voltage too high") among the codes stored in high-voltage battery charger J1050 on 2020-2021 e-tron quattro and e-tron Sportback that are attributable to old onboard-charger software (level 0070) rather than to failed charging hardware. On Audi specifically, this code is documented across 1 model.
What causes P0CA4 on Audi vehicles?▼
Common causes on Audi: Outdated onboard-charger software - Audi documents software 0070 as producing this and other "ghost" DTCs (TSB 2061788 / 2062631), Charging station delivering out-of-spec voltage, Faulty voltage measurement inside the onboard charger, High-voltage battery management or contactor fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0CA4 on a Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have P0CA4 documented?▼
Au7o has documented P0CA4 on 1 Audi model: e-tron.