What it means
The control module detects an intermittent or erratic signal in the hybrid/EV battery pack voltage sense D circuit.
How it works
The battery management module monitors pack-voltage sense channel D for a consistent reading. P0B22 sets when the D-channel signal becomes intermittent or erratic, which can happen with a loose connection, damaged wire, corrosion, or a faulty voltage sensor.
Common causes
Most likely first.
- Loose battery voltage sensing connection
- Damaged sensing wire
- Corroded connector
- Faulty battery voltage sensor
Symptoms
- Hybrid system warning light
- Reduced power
- Battery charge display may fluctuate
How to diagnose it
- Review freeze-frame data and channel D live data for fluctuations or dropouts, and compare them with the other pack-sense readings.
- Check whether the charge display fluctuates or the warning appears intermittently, and scan for related sensing codes.
- Inspect the channel D connector for corrosion, looseness, or damaged terminals and check accessible wiring for chafing or breaks.
- Use the manufacturer's circuit information to test channel D connections and monitor for signal interruptions under the specified test conditions.
- If wiring and connections are sound, have the channel D sensor and battery monitoring system checked using high-voltage safety procedures.
Common fixes
- Secure the loose channel D sensing connection.
- Clean or replace corroded channel D connector terminals.
- Repair or replace damaged channel D sensing wire.
- Replace a confirmed faulty channel D voltage sensor.
Can I keep driving?
A fluctuating charge display or intermittent power reduction can make remaining range and performance less predictable, so avoid long trips until it is checked. Stop safely if power drops significantly or a high-voltage warning appears.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.