What Does B1226 Mean?
This code indicates the Body Control Module (BCM) has detected an electrical fault in the circuit for fuel temperature sensor number 2. The sensor is used to monitor fuel temperature for fuel system compensation and evaporative emissions control. The fault could be an open circuit, short circuit, or sensor signal out of expected range.
Common Causes
40%
Wiring harness damage, chafing, or connector corrosion at fuel temperature sensor #2
35%
Failed fuel temperature sensor #2
15%
Poor ground connection or broken ground wire in fuel sensor circuit
10%
BCM internal fault or software issue
Diagnostic Steps
1
Step 1: Perform visual inspection of fuel temperature sensor #2 location (typically in fuel tank, fuel rail, or fuel line) for damaged wiring, corroded connectors, or physical sensor damage. Check connector pins for corrosion, bent pins, or moisture intrusion.
2
Step 2: Using a digital multimeter, backprobe the fuel temperature sensor connector and measure resistance across sensor terminals with ignition off. Compare readings to manufacturer specifications (typically 2000-3000 ohms at 68°F). Also measure supply voltage (typically 5V reference) with ignition on.
3
Step 3: Check circuit continuity from sensor connector back to BCM using wiring diagram. Test for opens, shorts to ground, or shorts to power. Verify ground circuit integrity with resistance test to known good ground (should be less than 1 ohm).
4
Step 4: If all circuits test good, substitute a known-good fuel temperature sensor and retest. Clear codes and monitor live data to verify sensor signal is within normal range. If fault persists with known-good sensor and verified wiring, suspect BCM fault and consider module testing or replacement.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an electrical fault in the circuit for fuel temperature sensor number 2. The sensor is used to monitor fuel temperature for fuel system compensation and evaporative emissions control. The fault could be an open circuit, short circuit, or...
The most common cause of B1226 (Fuel Temperature Sensor #2 Circuit Failure) is: Wiring harness damage, chafing, or connector corrosion at fuel temperature sensor #2
Typical repair costs for B1226 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive as this code affects fuel temperature monitoring but not critical engine operation. Repair at earliest convenience as it may affect fuel economy, cold start performance, and emissions system operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1226 to identify the root cause.
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Quick Info
Category
Body
System
Fuel System / Evaporative Emissions
Difficulty
Type
Manufacturer
Recommended Tools
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