P2671
Actuator Supply Voltage B Circuit High
Computer output / actuator power
Generic OBD-II
Medium
What it means
P2671 means the computer sees higher-than-expected voltage on actuator supply circuit B — one of the power feeds the ECM/PCM uses to drive engine actuators. Because several actuators can share this supply, a fault may affect more than one component, though it usually shows up as a warning light and occasional erratic operation rather than a no-start.
Medium
Can I keep driving? Often yes, but behavior can be erratic — this circuit powers engine actuators, so a supply-voltage fault may disturb several outputs. Get it checked soon.
Common symptoms
What you'll notice
- Check-engine light on
- Occasional erratic operation of engine actuators
- Other actuator or driver codes stored alongside it
- Possible reduced performance or limp mode
Common causes
Most likely first
- Short to voltage in the actuator supply wiringLikely
- Poor ground causing the supply to read highCommon
- Corroded or damaged connector on the supply circuitCommon
- Faulty relay feeding the actuator supplyLess often
- Faulty ECM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Scan for related codes and note which actuators share this supply; check P2670 (supply B low).
- Inspect the supply wiring and connectors for shorts to power or damage.
- Check the grounds and the relay feeding the circuit.
- Measure the supply voltage against spec with the circuit active.
- If wiring, grounds, and relay are good, suspect the ECM/PCM.
FAQ
Quick answers
Is it safe to drive with P2671?+
Often driveable, but operation may be erratic and other actuators can be affected. Have it diagnosed soon since it involves the engine's control outputs.
Can I just clear P2671?+
It returns until the wiring, ground, or supply fault is fixed.
Related codes
Often seen with P2671
Read & clear P2671 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