P2670
Actuator Supply Voltage B Circuit Low
Sensor/actuator supply voltage
Generic OBD-II
Medium
What it means
P2670 means the ECM-provided 'B' actuator supply-voltage rail is reading low. Because that rail can power several actuators, a low reading may show up as multiple driveability problems at once.
Medium
Can I keep driving? Drivable in many cases, but because this supply feeds several actuators, the engine may run poorly or set additional codes until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Multiple related actuator or performance codes
- Rough running or hesitation
- Possible reduced power / limp mode
Common causes
Most likely first
- Short-to-ground on the 'B' actuator supply circuitLikely
- A shorted actuator dragging the supply voltage downCommon
- Chafed or damaged wiring in the supply harnessCommon
- Corroded or loose connectorLess often
- Faulty ECM supply driverLess often
How to diagnose & fix
Work through it in order
- Read all stored codes; the supply feeds several actuators, so look for a pattern.
- Inspect the supply harness for shorts to ground or chafing.
- Disconnect actuators one at a time to isolate a shorted component.
- Repair wiring or connector faults on the supply circuit.
- If the circuit is clean, suspect the ECM supply driver. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2670?+
Sometimes, but a low actuator supply can cause erratic running. Have it diagnosed before relying on the vehicle.
Can I just clear P2670?+
It returns until the short or wiring fault pulling the supply low is repaired.
Related codes
Often seen with P2670
Read & clear P2670 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX