B1358 – Ignition Run Circuit Short To Ground

The ODBII code B1358 indicates a short circuit in the ignition run circuit to ground, which means there is an unintended connection that is causing the circuit to complete improperly, potentially affecting the vehicle’s ignition system.

The severity of ODBII code B1358 Ignition Run Circuit Short To Ground is moderate to high.

Common Causes For: B1357 Ignition Run Circuit Short To Battery

• Damaged wiring or connectors
• Shorted ignition switch
• Faulty ignition relay
• Grounding issues
• Corroded or loose connections
• Malfunctioning body control module (BCM)
• Aftermarket modifications or installations

Common misdiagnosis for B1358 Ignition Run Circuit Short To Ground

• Faulty ignition switch
• Shorted wiring harness
• Defective body control module (BCM)
• Malfunctioning relay
• Bad ground connections
• Faulty fuses
• Defective ignition coil
• Issues with the powertrain control module (PCM)
• Incorrectly installed aftermarket accessories
• Wiring insulation damage

Common Troubleshooting Steps

The OBD-II code B1358 indicates a problem with the ignition run circuit, specifically a short to ground. This can lead to issues with the vehicle’s electrical system, affecting components like the ignition system, fuel system, and other related systems. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Vehicle’s Battery and Connections: Ensure the battery is fully charged and in good condition.
• Inspect battery terminals and cables for corrosion, looseness, or damage.
• Inspect Fuses and Relays: Check the fuses related to the ignition system and other affected systems.
• Inspect relays for proper operation and replace any that are faulty.
• Visual Inspection of Wiring and Connectors: Look for damaged, frayed, or exposed wires in the ignition circuit.
• Check connectors for corrosion, bent pins, or loose connections.
• Test the Ignition Switch: Use a multimeter to test the ignition switch for proper operation.
• Ensure that the switch is making good contact in all positions (Off, Run, Start).
• Check for Shorts to Ground: Use a multimeter to check for continuity between the ignition run circuit and ground.
• If continuity is found, trace the wiring to locate the short.
• Inspect Ground Connections: Ensure that all ground connections related to the ignition system are clean and secure.
• Look for any ground wires that may be damaged or corroded.
• Scan for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may provide additional context.
• Address any other codes that may be present, as they could be related.
• Check Related Components: Inspect components that are part of the ignition run circuit, such as the ignition coil, fuel pump relay, and any associated sensors.
• Test these components for proper operation.
• Consult Wiring Diagrams: Refer to the vehicle’s service manual for wiring diagrams to understand the ignition run circuit layout.
• This can help in identifying potential problem areas.
• Perform a System Reset: After repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.1
• Seek Professional Help: If the issue persists after performing these steps, consider consulting a professional mechanic or automotive technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1358 code. Always ensure safety precautions are taken when working on a vehicle’s electrical system.