P2DB8: Battery Charging System B High Voltage Interlock Circuit Performance

The high-voltage interlock circuit of battery charging system B reports a circuit performance condition. Safety interlock chain may be compromised.

Most likely causes

• Interlock signal interrupted
• Interlock connector not seated

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. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

Good to know

• Repair difficulty: hard
• It can trigger limp mode.

What each character of P2DB8 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• D: Subsystem depends on the code range
• B8: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2DB8?

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 P2DB8?

The most common causes are: interlock signal interrupted; interlock connector not seated.

Related codes

• P0D16Battery Charging System A High Voltage Interlock Circuit Performance

Sources

• github.com: dtc database
• en.wikipedia.org: Battery management system

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.