P2670 — Low voltage in actuator power supply circuit B

This code indicates a low voltage issue in the power supply circuit for one of the engine's actuators, often related to a sensor or valve. It appears when the control module detects insufficient voltage, which can cause poor engine performance or erratic behavior.

Common causes

The cause is almost always one of a few things. Here they are — P2670 rarely comes from anything outside this list:

• Damaged or corroded wiring or connectors
• Faulty actuator or solenoid
• Blown fuse or relay in actuator circuit
• Poor ground connection
• Faulty engine control module (rare)

Where to start

In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:

1. Inspect and clean actuator wiring and connectors
2. Check and replace blown fuses or relays
3. Test actuator operation and replace if faulty
4. Verify and repair ground connections
5. Replace engine control module if all else fails

That is what holds for P2670 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.