B1226 – OBD-II DTC

OBD-II DTC B1226 – Fuel Temperature Sensor #2 Circuit Failure

DTC B1226 meaning

DTC B1226 refers to a fault in the Fuel Temperature Sensor #2 Circuit. This diagnostic trouble code indicates that the Engine Control Module (ECM) has detected an issue with the signal from the second fuel temperature sensor, which is responsible for monitoring the temperature of the fuel in the system. The ECM uses this information to optimize fuel delivery and engine performance.

DTC B1226 symptoms

Common symptoms associated with DTC B1226 may include:

• Check Engine Light illuminated
• Decreased engine performance
• Increased fuel consumption
• Engine stalling or misfiring
• Difficulty starting the engine

DTC B1226 causes

Several factors can lead to the occurrence of DTC B1226, including:

• Faulty fuel temperature sensor #2
• Wiring issues, such as shorts or open circuits in the sensor circuit
• Corroded or loose connectors
• Faulty Engine Control Module (ECM)
• Issues with the fuel system, such as contamination or blockages

DTC B1226 seriousness

DTC B1226 can be considered serious as it may affect engine performance and fuel efficiency. If left unaddressed, it could lead to more significant engine issues or damage over time. It is advisable to diagnose and repair the problem promptly to ensure optimal vehicle operation.

How to diagnose DTC B1226

To diagnose DTC B1226, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC B1226.
2. Inspect the fuel temperature sensor #2 and its wiring for visible damage or corrosion.
3. Check the electrical connections for tightness and cleanliness.
4. Test the fuel temperature sensor with a multimeter to ensure it is functioning within specifications.
5. Examine the ECM for any software updates or faults.
6. Clear the DTC and perform a road test to see if the code reappears.

How to fix DTC B1226 step-by-step instructions

To fix DTC B1226, follow these steps:

1. Identify and replace the faulty fuel temperature sensor #2 if it is defective.
2. Repair or replace any damaged wiring or connectors in the sensor circuit.
3. Ensure all connections are secure and free of corrosion.
4. Recheck the sensor operation with a multimeter after repairs.
5. Reprogram or replace the ECM if it is determined to be faulty.
6. Clear the DTC using an OBD-II scanner and perform a test drive to confirm the issue is resolved.

How to erase DTC B1226

To erase DTC B1226, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Access the DTC menu on the scanner and locate DTC B1226.
4. Select the option to clear or erase the trouble codes.
5. Disconnect the scanner and turn off the ignition.
6. Start the engine and monitor for any reoccurrence of the code.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.