What Does B1227 Mean?
This code indicates that the Body Control Module (BCM) or Powertrain Control Module (PCM) has detected an open circuit condition in the fuel temperature sensor #2 circuit. An open circuit means there is a break in the electrical pathway, preventing the sensor signal from reaching the control module. This sensor monitors fuel temperature to allow the control module to compensate for fuel density variations and optimize fuel delivery.
Common Causes
35%
Broken or disconnected wiring between fuel temperature sensor #2 and the control module
30%
Failed fuel temperature sensor #2 with internal open circuit
25%
Corroded or loose electrical connector at fuel temperature sensor #2
10%
Failed control module (BCM/PCM) with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of fuel temperature sensor #2 location (typically in fuel tank, fuel rail, or fuel line). Check connector for corrosion, damage, pushed-out pins, and ensure it is fully seated. Check wiring harness for visible damage, chafing, or breaks.
2
Step 2: Using a digital multimeter, disconnect the fuel temperature sensor connector and measure resistance across the sensor terminals. Compare readings to manufacturer specifications (typically 2000-3000 ohms at 68°F). An infinite reading confirms sensor internal open circuit.
3
Step 3: With sensor disconnected, use multimeter to check continuity of each wire in the sensor circuit from the connector back to the control module. Check for open circuits (infinite resistance) in signal wire, ground wire, and reference voltage wire.
4
Step 4: At the control module connector (with harness still connected), backprobe the fuel temperature sensor signal circuit and measure voltage. Should see reference voltage (typically 5V). If no voltage present, suspect control module fault.
5
Step 5: After repair (sensor replacement, wiring repair, or connector cleaning), clear codes and perform a drive cycle. Monitor live data for fuel temperature sensor #2 to verify proper operation and confirm sensor readings change appropriately with temperature.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or Powertrain Control Module (PCM) has detected an open circuit condition in the fuel temperature sensor #2 circuit. An open circuit means there is a break in the electrical pathway, preventing the sensor signal from reaching the control module....
The most common cause of B1227 (Fuel Temperature Sensor #2 Circuit Open) is: Broken or disconnected wiring between fuel temperature sensor #2 and the control module
Typical repair costs for B1227 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive as fuel temperature compensation is a minor correction factor for fuel delivery. May experience slight fuel economy reduction or minor driveability issues in extreme temperature conditions, but normal operation should continue.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1227 to identify the root cause.
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Quick Info
Category
Body
System
Fuel System
Difficulty
Type
Manufacturer
Recommended Tools
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