B1847 – Ignition Tamper Circuit Short To Battery

The ODBII code B1847 indicates a fault in the ignition tamper circuit, specifically a short to battery, which suggests that there is an electrical issue causing the circuit to receive constant power instead of functioning normally.

The severity of ODBII code B1847 is moderate.

Common Causes For: B1846 Ignition Tamper Circuit Open

• Shorted wiring in the ignition tamper circuit.
• Faulty ignition switch.
• Damaged connectors or terminals.
• Corroded wiring or connections.
• Malfunctioning anti-theft system.
• Defective body control module (BCM).
• Improper installation of aftermarket accessories.

Common misdiagnosis for B1847 Ignition Tamper Circuit Short To Battery

• Faulty ignition switch
• Shorted wiring harness
• Defective body control module (BCM)
• Malfunctioning key fob or transponder
• Issues with the anti-theft system
• Battery connection problems
• Faulty relays or fuses

Common Troubleshooting Steps

The OBD-II code B1847 refers to an issue with the ignition tamper circuit, indicating a short to battery. This code is often associated with problems in the vehicle’s security or ignition system. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check the Vehicle’s Battery:: Ensure the battery is fully charged and in good condition. A weak or failing battery can cause various electrical issues.
• Inspect Wiring and Connectors:: Visually inspect the wiring and connectors related to the ignition tamper circuit. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to any wiring harnesses that may be pinched, frayed, or exposed.
• Test the Ignition Switch:: Check the ignition switch for proper operation. A faulty ignition switch can cause incorrect signals to be sent to the vehicle’s computer.
• Use a multimeter to test the switch for continuity and proper voltage output.
• Check for Short Circuits:: Use a multimeter to check for shorts in the ignition tamper circuit. Disconnect the battery and test the circuit for continuity to ground.
• If a short is found, trace the wiring to locate the source of the short.
• Inspect the Security System:: If the vehicle is equipped with an aftermarket security system, ensure it is properly installed and functioning. Malfunctions in these systems can trigger false codes.
• Check for any additional modules that may be part of the security system and ensure they are functioning correctly.
• Scan for Additional Codes:: Use an OBD-II scanner to check for any other trouble codes that may be present. Other codes can provide additional context for the issue.
• Address any other codes before focusing solely on B1847.
• Clear the Code:: After performing inspections and repairs, clear the trouble code using an OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears.
• Consult the Service Manual:: Refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the ignition tamper circuit.
• Seek Professional Help:: If the issue persists after performing the above steps, consider seeking assistance from a qualified mechanic or automotive technician. They may have specialized tools and knowledge to diagnose and repair the problem effectively. By following these steps, you should be able to identify and resolve the issue related to the B1847 code.