What Does P2670 Mean?
The Engine Control Module has detected voltage in the "B" actuator supply circuit that is below the minimum threshold. This supply voltage powers various engine actuators such as fuel injectors, VVT solenoids, or other electronically controlled components. Low voltage can prevent proper actuator operation.
Common Causes
30%
High resistance or corrosion in actuator power supply wiring
25%
Faulty actuator power relay or relay contacts
20%
Poor connection at power distribution terminal or fuse box
15%
Weak battery or charging system not providing adequate voltage
10%
Failed ECM power supply driver circuit
Diagnostic Steps
1
Step 1: Check battery voltage with engine running; should be 13.5-14.5V, indicating proper charging system operation
2
Step 2: Locate and test actuator power relay "B"; verify relay energizes and check contact voltage drop
3
Step 3: Measure voltage at actuator supply circuit with actuators disconnected; should match battery voltage
4
Step 4: Check for voltage drop across power supply circuit from relay to actuators under load conditions
5
Step 5: Inspect all power distribution connections, fuses, and fusible links for corrosion or high resistance
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The Engine Control Module has detected voltage in the "B" actuator supply circuit that is below the minimum threshold. This supply voltage powers various engine actuators such as fuel injectors, VVT solenoids, or other electronically controlled components. Low voltage can prevent proper actuator ope...
The most common cause of P2670 (Actuator Supply Voltage "B" Circuit Low) is: High resistance or corrosion in actuator power supply wiring
Typical repair costs for P2670 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause sudden loss of power, stalling, or failure to start. Vehicle may be unreliable and should be repaired before extended driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2670 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management Electrical System
Difficulty
Type
Generic (SAE)
Recommended Tools
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