P0EBB: A/C Compressor Motor Phase V Current Sensor Circuit Low

What it means

A/C Compressor Motor Phase V Current Sensor Circuit Low: the signal voltage is below the expected range. Often a short to ground or high resistance in the wiring.

At a glance

• Usually lights the check-engine light
• The engine or gearbox may go into limp mode

How it works

The phase V current sensor provides the control module with a reading of current in the A/C compressor motor's V phase. P0EBB sets when that reading falls below the expected lower limit.

Common causes

Most likely first.

1. Current sensor failed
2. Wiring fault
3. Connector pins corroded - high contact resistance

Symptoms

• A/C warning light or check-engine light
• Air conditioning may cool poorly or stop cooling

How to diagnose it

1. Review freeze-frame data and live phase V readings, comparing them with phase U and the A/C operating state.
2. Inspect the phase V sensor plug and wiring for corrosion, loose terminals, damage, or a weak ground connection.
3. Check the phase V signal and ground for a short to ground, open, or high resistance using the manufacturer's specification.
4. Test the phase V sensor output under the specified conditions and confirm whether it remains low with the wiring verified.
5. If the sensor circuit passes, check the compressor inverter for a phase V fault using the service information.

Common fixes

• Reseat the phase V connector and repair poor or corroded terminal contact.
• Repair an open, short to ground, or high-resistance section of phase V wiring.
• Replace the phase V current sensor if it fails the specified output test.
• Repair or replace the compressor inverter if diagnostic testing identifies it as the cause.

Can I keep driving?

A/C may cool poorly or stop cooling, so avoid relying on it for defogging or temperature control until diagnosed. Follow any hybrid-system warning instructions if they appear.