Electric A/C compressors run a three-phase permanent-magnet motor whose inverter measures the phase currents in order to commutate it and limit torque. P0EB1 is the general circuit fault of the phase U current sensor: the controller gets no usable signal and gives no finer verdict on it. P0EB1 is not described in any public maker document. GM's 2011 Volt checked the same sensors under the older codes P0D7A to P0D7F, testing at standstill with zero speed request; any reading of 68 A or more in either direction (30 of 60 samples, 50 ms) counted as a sensor fault, Type B, and only a 12 V reset allowed a new pass. The sensor belongs to the inverter, so the usual repair is the compressor assembly. U-phase details: P0EB2 to P0EB4.
Low severity. Can I keep driving?Yes, you can keep driving. The air conditioning may not work.
Symptoms
- Compressor does not run, cabin stays warm
- Climate system warning
Most likely causes
- Failed phase U current sensor in the compressor inverter
- Open signal path between sensor and inverter controller
- Fault on the inverter control board
What to check, in order
Start with the simplest. You can tick off each step.
What each character of P0EB1 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- E: Subsystem depends on the code range
- B1: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0EB1?
Yes, you can keep driving. The air conditioning may not work.
What causes code P0EB1?
The most common causes are: failed phase U current sensor in the compressor inverter; open signal path between sensor and inverter controller; fault on the inverter control board.
Related codes
- P0EB2A/C Compressor Motor Phase U Current Sensor Circuit High
- P0EB3A/C Compressor Motor Phase U Current Sensor Circuit Low
- P0EB4A/C Compressor Motor Phase U Current Sensor Range/Performance
- P0EBBA/C Compressor Motor Phase V Current Sensor Circuit
- P0EC0A/C Compressor Motor Phase W Current Sensor Circuit
- P0D7AA/C Compressor Motor Phase U Current Low
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.