P0B22: Hybrid/EV Battery Pack Voltage Sense D Circuit Intermittent/Erratic

P0B22 completes the voltage sense D series and reports an intermittent or erratic pack voltage measurement D: the reading jumps, drops out briefly or changes implausibly fast, then recovers. Current code lists title it this way; the older label Generator Phase U Current Sensor Circuit does not belong to this number. No manufacturer documents P0B22 publicly; GM's published tables only cover channel A (P0ABB to P0ABD). CARB requires circuit monitoring of battery voltage sensors in hybrid storage systems. Steady faults of channel D are P0B1E to P0B21, the same fault type on channels B and C is P0B18 and P0B1D. Loose terminals or chafed sense leads are typical, so the warning comes and goes.

High severity. Can I keep driving?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.

Symptoms

Warning comes and goes, often stored as history
Battery power limited, reduced electric drive or assist
Vehicle may not reach Ready or may shut down the high-voltage system

Most likely causes

Loose or corroded sense connector or terminal
Chafed sense lead with intermittent contact
Controller software misinterprets transients

What to check, in order

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

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Gently move the wiring with the engine running and watch whether the reading changes.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
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 P0B22 means

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

Frequently asked questions

Can I keep driving with code P0B22?

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 P0B22?

The most common causes are: loose or corroded sense connector or terminal; chafed sense lead with intermittent contact; controller software misinterprets transients.

Related codes

Sources

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.