P0DAC: Hybrid/EV Battery Cell Balancing Circuit A

P0DAC reports an electrical fault in balancing circuit A, meaning the wiring, switch or monitoring chip behind it, not a balancing result. Audi uses it on the e-tron GT (2022-2026) in battery management address 008C and spells it out as an electrical fault of cell controller 1. Bulletin 2074056 explains that a short power interruption while the 12 V battery is reconnected can log this entry; the guided fault finding then proposes new HV modules, which Audi calls unnecessary and resets remotely. A later reporting case (2078729) pairs P0DAC00 with the red onboard supply lamp and a car that will not start. Audi already listed P0DAC00 for the 2016 A3 e-tron (bulletin 2046556), where new software cured it. Stuck states and implausible results are P0DAD to P0DAF.

Symptoms

• Battery management warning or red onboard supply lamp
• Vehicle may refuse to start or enter drive readiness
• Diagnostic tester proposes replacing HV battery modules

Most likely causes

• Brief 12 V supply interruption, e.g. while reconnecting the 12 V battery (Audi e-tron GT)
• Defective cell monitoring controller or balancing switch of circuit A
• Loose or corroded sense/balancing lead connector at the module

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Make sure the battery cooling air intake is clean
3. Check the 12 V auxiliary battery, which can also trigger warnings
4. Leave any high-voltage measurements to a specialized repair shop

Good to know

• It can trigger limp mode.
• It affects emissions.

What each character of P0DAC means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• D: Subsystem depends on the code range
• AC: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0DAC?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0DAC?

The most common causes are: brief 12 V supply interruption, e.g. while reconnecting the 12 V battery (Audi e-tron GT); defective cell monitoring controller or balancing switch of circuit A; loose or corroded sense/balancing lead connector at the module.

Related codes

• P0DABHybrid/EV Battery Cell Balancing Performance
• P0DADHybrid/EV Battery Cell Balancing Circuit A Stuck On
• P0DAEHybrid/EV Battery Cell Balancing Circuit A Stuck Off
• P0DAFHybrid/EV Battery Cell Balancing Circuit A Range/Performance
• P0DB0Hybrid/EV Battery Cell Balancing Circuit B

Sources

• law.cornell.edu: 13 CCR 1968.2
• static.nhtsa.gov: MC 11005945 0001
• static.nhtsa.gov: MC 11034667 0001
• static.nhtsa.gov: MC 10119387 9999

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.