P0BED is the general circuit code of the phase W current sensor in the drive motor A inverter, for an electrical fault outside the offset, low and high categories. No manufacturer documents this exact code publicly; GM's hybrid tables from the 2011 Volt to 2019, including the BAS Plus (eAssist) system, use P0BEE, P0BEF and P0BF0 instead. CARB requires hybrid sensor circuits to be monitored. Phase W matters even on systems with only two sensors: GM's eAssist table measures U and W and, if either sensor fails, runs current control in an alternate mode without the sensors. Expect reduced motor A torque, and check for related inverter codes before replacing parts.
High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.
Symptoms
- Hybrid system warning and malfunction indicator lamp
- Reduced power or assist from drive motor A
Most likely causes
- Failed phase W current sensor inside the inverter
- Supply or signal fault on the inverter's sensor board
- Software fault in the motor control processor
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- It can trigger limp mode.
- It affects emissions.
What each character of P0BED means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- B: Subsystem depends on the code range
- ED: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0BED?
If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.
What causes code P0BED?
The most common causes are: failed phase W current sensor inside the inverter; supply or signal fault on the inverter's sensor board; software fault in the motor control processor.
Related codes
- P0BEEDrive Motor A Phase W Current Sensor Circuit Range/Performance
- P0BEFDrive Motor A Phase W Current Sensor Circuit Low
- P0BF0Drive Motor A Phase W Current Sensor Circuit High
- P0BE5Drive Motor A Phase U Current Sensor Circuit
- P0BE9Drive Motor A Phase V Current Sensor Circuit
- P0BFDDrive Motor A Phase U-V-W Current Sensor Correlation
- P0BF9Drive Motor B Phase W Current Sensor Circuit
Sources
- law.cornell.edu: 13 CCR 1968.2
- gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics
- gsi.ext.gm.com: 13OBDG05C Hybrid Diagnostics
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.