B1355 – Ignition Run Circuit Failure

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The ODBII code B1355 indicates a failure in the ignition run circuit, which typically means there is a problem with the electrical circuit that powers the ignition system when the key is in the “run” position.

The severity of ODBII code B1355 Ignition Run Circuit Failure is moderate.

Common Causes For: B1354 Ignition Key-In Circuit Short To Ground

  • Faulty ignition switch
  • Damaged wiring or connectors
  • Poor ground connections
  • Malfunctioning body control module (BCM)
  • Short circuit in the ignition run circuit
  • Open circuit in the ignition run circuit
  • Faulty relays or fuses related to the ignition system

Common misdiagnosis for B1355 Ignition Run Circuit Failure

  • Faulty ignition switch
  • Bad wiring or connectors
  • Defective body control module (BCM)
  • Malfunctioning powertrain control module (PCM)
  • Issues with the battery or charging system
  • Faulty relays or fuses
  • Problems with the instrument cluster
  • Incorrectly installed aftermarket accessories

Common Troubleshooting Steps

The OBD-II code B1355 indicates an “Ignition Run Circuit Failure.” This code is typically associated with issues in the ignition system, particularly in the circuit that powers the ignition system when the key is in the “Run” position. Here are some common troubleshooting steps to diagnose and resolve this issue:

  • Check the Battery: Ensure that the battery is fully charged and in good condition. A weak or dead battery can cause various electrical issues.
  • Inspect Fuses: Check the fuses related to the ignition system. A blown fuse can interrupt the ignition run circuit.
  • Examine Wiring and Connectors: Inspect the wiring and connectors associated with the ignition system for any signs of damage, corrosion, or loose connections. Pay special attention to the ignition switch and any related harnesses.
  • Test the Ignition Switch: The ignition switch itself may be faulty. Use a multimeter to test the switch for continuity in the “Run” position. If it does not provide continuity, the switch may need to be replaced.
  • Check for Ground Issues: Ensure that all ground connections related to the ignition system are secure and free of corrosion. Poor grounding can lead to circuit failures.
  • Scan for Additional Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
  • Inspect the PCM (Powertrain Control Module): In some cases, the PCM may be at fault. Check for any software updates or known issues with the PCM for your specific vehicle model.
  • Test the Ignition Relay: If your vehicle uses an ignition relay, test it to ensure it is functioning properly. A faulty relay can prevent the ignition system from receiving power.
  • Check for Short Circuits: Look for any short circuits in the wiring that could be causing the ignition run circuit to fail. This may require a more in-depth inspection of the wiring harness.
  • Consult Wiring Diagrams: Refer to the vehicle’s service manual for wiring diagrams to understand the ignition circuit better and identify any potential problem areas. 1
  • Professional Diagnosis: If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue causing the B1355 code. Always remember to take necessary safety precautions when working on electrical systems.

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