What Does P2665 Mean?
The PCM has detected an open circuit or complete lack of continuity in the control circuit for Fuel Shutoff Valve B. This valve controls fuel flow to specific engine components or cylinders, and the circuit fault prevents proper valve operation.
Common Causes
35%
Broken or disconnected wiring in the fuel shutoff valve control circuit
30%
Failed fuel shutoff valve B solenoid with open internal coil
20%
Corroded or damaged connector pins at valve or PCM
10%
Failed PCM driver circuit for valve control
5%
Blown fuse in fuel shutoff valve circuit
Diagnostic Steps
1
Step 1: Visually inspect fuel shutoff valve B connector and wiring for damage, corrosion, or disconnection
2
Step 2: Measure resistance of fuel shutoff valve B solenoid (typically 10-50 ohms); replace if open circuit
3
Step 3: Check continuity of control wire from PCM to valve connector with valve disconnected
4
Step 4: Verify voltage supply to valve when commanded on using multimeter or scan tool
5
Step 5: If all circuits test good, suspect PCM internal driver failure
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or complete lack of continuity in the control circuit for Fuel Shutoff Valve B. This valve controls fuel flow to specific engine components or cylinders, and the circuit fault prevents proper valve operation.
The most common cause of P2665 (Fuel Shutoff Valve "B" Control Circuit/Open) is: Broken or disconnected wiring in the fuel shutoff valve control circuit
Typical repair costs for P2665 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may run roughly or have limited power output. Generally safe to drive short distances to service facility, but fuel economy and performance will be affected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2665 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
