P0EB2: A/C Compressor Motor Phase U Current Sensor Circuit High

P0EB2 is set when the phase U current sensor of the electric A/C compressor sends a signal above its valid window. Current sensors in such inverters often output a voltage centred on zero current, so a stuck-high output reads like a large current in one direction even with the motor at rest. No manufacturer documents P0EB2 publicly. GM's 2011 Volt ran a standstill test that catches exactly this: plus 68 A or more on phase U with no speed request set the older code P0D7A, Type B. A short to the sensor supply, a damaged Hall element or a fault on the inverter board are typical. The compressor controller stops the motor to protect the power stage. P0EB3 covers the low side; P0EB5 and P0EB8 report the same fault on phases V and W.

Symptoms

• Compressor will not start or stops at once
• No cooling during hot weather

Most likely causes

• Damaged Hall element of the phase U sensor
• Phase U signal shorted to the sensor supply
• Defect on the inverter board affecting the U channel

What to check, in order

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

1. Check the sensor pressure in live data
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
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 P0EB2 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• E: Subsystem depends on the code range
• B2: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0EB2?

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

What causes code P0EB2?

The most common causes are: damaged Hall element of the phase U sensor; phase U signal shorted to the sensor supply; defect on the inverter board affecting the U channel.

Related codes

• P0EB3A/C Compressor Motor Phase U Current Sensor Circuit Low
• P0EB1A/C Compressor Motor Phase U Current Sensor Circuit
• P0EB4A/C Compressor Motor Phase U Current Sensor Range/Performance
• P0EB5A/C Compressor Motor Phase V Current Sensor Circuit High
• P0EB8A/C Compressor Motor Phase W Current Sensor Circuit High
• P0D7AA/C Compressor Motor Phase U Current 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.