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.

Likely causes

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

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: gsi.ext.gm.com, law.cornell.edu.