P0EAB: A/C Compressor Motor Voltage Sensor B Circuit Low

P0EAB is set when the B voltage channel of the electric A/C compressor reports far less than the high-voltage battery actually supplies while the contactors are closed. Typical reasons are a sense line shorted to ground, a broken internal connection or a sensing stage without supply; a supply interrupted upstream, for instance by a high-voltage fuse, produces the same picture and should be ruled out first. No manufacturer documents P0EAB publicly. For the A channel (P0D6B), GM's 2011 Volt uses 190 V or less in 30 of 60 samples, contactors closed and no faults present, Type B. CARB calls for range checks of such inputs where hybrid cooling depends on them. The air conditioning, and possibly battery cooling, fails; the high counterpart is P0EAA.

Symptoms

• No cooling from the air conditioning
• Charging power may be reduced if the battery cannot be cooled

Most likely causes

• Voltage sense line shorted to ground
• High-voltage supply to the compressor interrupted (fuse, connector)
• Measuring stage in the compressor module without supply

What to check, in order

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

1. Check the sensor pressure in live data
2. With the connector unplugged, check whether the signal wire is making contact with ground.
3. Check the relay and connector
4. Have the refrigerant charge and any leaks checked at a repair shop authorized to handle refrigerant

What each character of P0EAB means

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

Frequently asked questions

Can I keep driving with code P0EAB?

Yes, you can keep driving. The air conditioning may not work.

What causes code P0EAB?

The most common causes are: voltage sense line shorted to ground; high-voltage supply to the compressor interrupted (fuse, connector); measuring stage in the compressor module without supply.

Related codes

• P0EAAA/C Compressor Motor Voltage Sensor B Circuit High
• P0EA9A/C Compressor Motor Voltage Sensor B Circuit Performance
• P0EA8A/C Compressor Motor Voltage Sensor B Circuit
• P0D6BA/C Compressor Motor Voltage Sensor A Circuit Low
• P2D42A/C Compressor Motor Voltage B Low

Sources

• gsi.ext.gm.com: 11OBDG01 HYBRID Diagnostics
• law.cornell.edu: 13 CCR 1968.2

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.