B1202 – Fuel Sender Circuit Open

The ODBII code B1202 indicates that there is an open circuit in the fuel sender, which means the fuel level sensor is not providing a signal to the vehicle’s computer, potentially leading to inaccurate fuel level readings.

The severity of ODBII code B1202 Fuel Sender Circuit Open is moderate.

Common Causes For: B1201 Fuel Sender Circuit Failure

• Faulty fuel level sensor
• Damaged wiring or connectors in the fuel sender circuit
• Poor ground connection
• Open circuit due to a break in the wiring
• Corroded or loose connectors
• Malfunctioning fuel gauge
• Issues with the engine control module (ECM)

Common misdiagnosis for B1202 Fuel Sender Circuit Open

• Faulty fuel gauge
• Bad fuel pump
• Wiring issues
• Faulty instrument cluster
• Bad ground connection
• Fuel level sensor failure
• ECU/PCM issues

Common Troubleshooting Steps

The OBD-II code B1202 indicates a problem with the fuel sender circuit, specifically that there is an open circuit. This can lead to inaccurate fuel level readings on the dashboard. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check the Fuel Sender Unit:
• Inspect the fuel sender unit for any visible damage or corrosion.
• Ensure that the fuel sender is properly connected to the wiring harness.
• Inspect Wiring and Connectors:
• Check the wiring leading to the fuel sender for any signs of wear, fraying, or damage.
• Look for loose or corroded connectors that may be causing an open circuit.
• Use a multimeter to test for continuity in the wiring. If there is no continuity, the wire may be broken or disconnected.
• Test the Fuel Sender:
• If accessible, test the fuel sender unit itself. You can do this by measuring the resistance across the sender terminals with a multimeter. The resistance should change as the float moves.
• If the resistance is not within the manufacturer’s specifications, the fuel sender may need to be replaced.
• Check the Ground Connection:
• Ensure that the ground connection for the fuel sender is secure and free of corrosion. A poor ground can cause an open circuit.
• Inspect the Fuel Pump Module:
• In some vehicles, the fuel sender is part of the fuel pump module. If the module is faulty, it may need to be replaced.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any other related trouble codes that may provide additional context for the issue.
• Clear the Code and Test Drive:
• After performing the checks and repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult the Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the fuel sender circuit.
• Seek Professional Help:
• If the issue persists after performing these steps, it may be necessary to consult a professional mechanic for further diagnosis and repair. By following these steps, you should be able to identify and resolve the issue related to the B1202 code.