B1363 – Ignition Start Circuit Failure

The ODBII code B1363 indicates a malfunction in the ignition start circuit, which may prevent the engine from starting or cause issues with the ignition system.

The severity of ODBII code B1363 is moderate to severe.

Common Causes For: B1362 Ignition Run/Acc Circuit Short To Ground

• Faulty ignition switch
• Damaged wiring or connectors in the ignition circuit
• Failed starter relay
• Defective powertrain control module (PCM)
• Malfunctioning anti-theft system
• Weak or dead battery
• Poor ground connections
• Faulty ignition coil or module

Common misdiagnosis for B1363 Ignition Start Circuit Failure

• Faulty ignition switch
• Bad starter motor
• Weak battery or poor battery connections
• Defective neutral safety switch
• Wiring issues or shorts in the ignition circuit
• Malfunctioning relay or fuse
• Faulty key or key fob
• Issues with the engine control module (ECM) or body control module (BCM)

Common Troubleshooting Steps

The OBD-II code B1363 refers to an “Ignition Start Circuit Failure.” This code typically indicates a problem with the ignition system or the circuit that controls the ignition start process. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Battery:
• Ensure the battery is fully charged and in good condition. A weak or dead battery can cause ignition issues.
• Inspect Fuses:
• Check the fuses related to the ignition system. A blown fuse can interrupt the ignition start 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 starter relay.
• Test the Ignition Switch:
• Use a multimeter to test the ignition switch for proper operation. If the switch is faulty, it may need to be replaced.
• Check the Starter Relay:
• Test the starter relay to ensure it is functioning correctly. A faulty relay can prevent the ignition system from receiving power.
• Inspect the Starter Motor:
• Check the starter motor for proper operation. If the starter is faulty, it may need to be repaired or replaced.
• 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.
• Check for Ground Issues:
• Ensure that all ground connections related to the ignition system are secure and free of corrosion.
• Test the Ignition Coil(s):
• If applicable, test the ignition coil(s) to ensure they are functioning properly. A faulty coil can lead to ignition problems.
• Inspect the PCM (Powertrain Control Module):
• In some cases, the issue may be related to the PCM. Check for any software updates or faults in the module. 1
• Consult Wiring Diagrams:
• Refer to the vehicle’s wiring diagrams to trace the ignition start circuit and identify any potential issues. 1
• Perform a Visual Inspection:
• Conduct a thorough visual inspection of the engine bay and under the dashboard for any signs of wear, damage, or loose connections. If you are unable to resolve the issue after performing these steps, it may be advisable to consult a professional mechanic or technician for further diagnosis and repair.