What it means
The ECM detects a low fault on the a/c compressor motor current sensor circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The A/C compressor motor current sensor measures compressor current for the control module. P0EB1 sets when the sensor signal falls below its permitted range, often because the signal is shorted to ground, the sensor is internally shorted, or a corroded connection adds resistance.
Common causes
Most likely first.
- Signal wire shorted to ground
- Internal sensor short
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine or hybrid system warning light
- Air conditioning may not cool
- Cooling may be intermittent
How to diagnose it
- Check freeze-frame and live data to confirm the low current sensor reading and note whether it changes when compressor operation is requested.
- Inspect the current sensor connector and wiring for corrosion, moisture, crushed insulation, or a signal wire touching ground.
- Check the sensor's reference or supply and ground connections for poor contact or excessive resistance using the manufacturer's wiring information.
- With the system disabled according to manufacturer instructions, test the signal circuit for a short to ground and verify continuity.
- If the circuit passes, test the current sensor against the manufacturer's specification for an internal fault.
Common fixes
- Clean or repair corroded current sensor connector terminals.
- Repair the signal wire where it is shorted to ground or damaged.
- Restore a sound current sensor ground or reference connection.
- Replace the current sensor if it fails its specified circuit test.
Can I keep driving?
The control module may limit or stop A/C operation, so cooling may be weak or unavailable. Follow any vehicle stop-driving warning; otherwise, avoid relying on climate control and have the circuit checked promptly.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.