What Does P2669 Mean?
The PCM has detected an open circuit or voltage fault in the secondary actuator supply voltage circuit (B circuit). This reference voltage powers various engine actuators and sensors, and the fault will prevent proper operation of multiple components.
Safety Warning
May cause multiple actuator failures leading to no-start, stalling, or severe drivability issues. Not recommended to drive until repaired as engine may shut down unexpectedly.
Common Causes
35%
Blown fuse in actuator supply voltage B circuit
25%
Open circuit in main actuator supply voltage wiring harness
20%
Failed PCM internal voltage regulator for actuator supply B
15%
Short to ground in one or more actuators causing overcurrent protection
5%
Corroded or loose connector at main actuator power distribution point
Diagnostic Steps
1
Step 1: Check all fuses related to actuator power supply circuits using wiring diagram
2
Step 2: Measure voltage at actuator supply B circuit (typically 5V or 12V depending on system)
3
Step 3: Disconnect actuators one at a time to isolate potential short causing supply failure
4
Step 4: Check continuity of actuator supply voltage B wire from PCM to actuator distribution points
5
Step 5: Monitor actuator supply voltage with scan tool during key cycles to detect intermittent faults
Estimated Repair Cost
$100 - $900
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or voltage fault in the secondary actuator supply voltage circuit (B circuit). This reference voltage powers various engine actuators and sensors, and the fault will prevent proper operation of multiple components.
The most common cause of P2669 (Actuator Supply Voltage "B" Circuit /Open) is: Blown fuse in actuator supply voltage B circuit
Typical repair costs for P2669 range from $100 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause multiple actuator failures leading to no-start, stalling, or severe drivability issues. Not recommended to drive until repaired as engine may shut down unexpectedly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2669 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management / Electrical System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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