B1219 – Fuel Tank Pressure Sensor Circuit Failure

The ODBII code B1219 indicates a malfunction in the fuel tank pressure sensor circuit, which may affect the vehicle’s ability to monitor fuel vapor levels and emissions.

The severity of ODBII code B1219 is moderate.

Common Causes For: B1218 Horn Relay Coil Circuit Short to Vbatt

• Faulty fuel tank pressure sensor
• Damaged wiring or connectors
• Short circuit in the sensor circuit
• Open circuit in the sensor circuit
• Corroded connectors
• Faulty engine control module (ECM)
• Vacuum leaks in the fuel system
• Improperly installed or damaged fuel tank
• Software issues in the vehicle’s computer system

Common misdiagnosis for B1219 Fuel Tank Pressure Sensor Circuit Failure

• Faulty fuel tank pressure sensor
• Wiring issues or shorts in the sensor circuit
• Faulty engine control module (ECM)
• Evaporative emissions system leaks
• Faulty fuel cap or seal
• Issues with the purge valve or vent valve
• Vacuum leaks in the intake system
• Problems with the fuel pump or fuel system
• Incorrectly diagnosed fuel system pressure issues
• Misinterpretation of related OBDII codes

Common Troubleshooting Steps

When dealing with OBD-II code B1219, which indicates a “Fuel Tank Pressure Sensor Circuit Failure,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues.
• Inspect the Fuel Tank Pressure Sensor: Locate the fuel tank pressure sensor, which is typically mounted on or near the fuel tank.
• Check for physical damage, corrosion, or loose connections at the sensor and its wiring harness.
• Examine Wiring and Connectors: Inspect the wiring leading to the fuel tank pressure sensor for any signs of wear, fraying, or damage.
• Ensure that all connectors are secure and free of corrosion. Clean any corroded connectors if necessary.
• Test the Fuel Tank Pressure Sensor: Use a multimeter to test the resistance and voltage output of the fuel tank pressure sensor according to the manufacturer’s specifications.
• Compare the readings to the expected values in the service manual. If the readings are outside the specified range, the sensor may need to be replaced.
• Check for Vacuum Leaks: Inspect the fuel system for any vacuum leaks that could affect the fuel tank pressure sensor’s readings. This includes checking hoses and connections for cracks or disconnections.
• Inspect the Fuel Tank and Evaporative Emission System: Check the fuel tank for any signs of damage or deformation.
• Inspect the evaporative emission control (EVAP) system components, including the charcoal canister and purge valve, for proper operation.
• Test the Power and Ground Supply: Verify that the fuel tank pressure sensor is receiving the correct voltage and has a good ground connection. Use a multimeter to check for power and ground at the sensor connector.
• Clear the Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code returns. Monitor the fuel tank pressure sensor readings if your scanner allows it.
• Consult the Service Manual: If the issue persists, refer to the vehicle’s service manual for specific diagnostic procedures related to the fuel tank pressure sensor and circuit.
• Seek Professional Help: If you are unable to resolve the issue after following these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify the cause of the B1219 code and take appropriate action to resolve it.