B1367 – Ignition Tach Circuit Failure

The ODBII code B1367 indicates a failure in the ignition tach circuit, which typically relates to issues with the vehicle’s tachometer or the signal from the ignition system to the engine control module.

The severity of ODBII code B1367 Ignition Tach Circuit Failure is moderate.

Common Causes For: B1366 Ignition Start Circuit Short To Ground

• Faulty ignition coil
• Damaged wiring or connectors
• Failed tachometer
• Malfunctioning engine control module (ECM)
• Poor ground connection
• Faulty crankshaft or camshaft position sensor
• Interference from aftermarket accessories

Common misdiagnosis for B1367 Ignition Tach Circuit Failure

• Faulty ignition coil
• Bad spark plugs
• Wiring issues or shorts in the ignition system
• Faulty crankshaft position sensor
• Faulty camshaft position sensor
• Engine control module (ECM) issues
• Fuel delivery problems
• Battery or charging system issues

Common Troubleshooting Steps

The OBD-II code B1367 refers to an “Ignition Tach Circuit Failure.” This code typically indicates a problem with the tachometer signal, which is used by the engine control module (ECM) to monitor engine speed. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Vehicle’s Battery and Charging System:: Ensure the battery is fully charged and in good condition.
• Check the alternator and charging system for proper operation.
• Inspect Wiring and Connectors:: Examine the wiring harness and connectors related to the tachometer and ignition system for any signs of damage, corrosion, or loose connections.
• Repair or replace any damaged wires or connectors.
• Test the Tachometer:: If the vehicle has a separate tachometer gauge, verify that it is functioning correctly. If it is not, the issue may be with the gauge itself.
• Check the Ignition System:: Inspect the ignition coils, spark plugs, and ignition control module for proper operation.
• Replace any faulty components as necessary.
• Scan for Additional Codes:: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide additional context for the issue.
• Inspect the ECM:: Check the engine control module for any signs of damage or failure. If necessary, reprogram or replace the ECM.
• Test the Tach Signal:: Use a multimeter or oscilloscope to test the tachometer signal at the ECM. Compare the readings to the manufacturer’s specifications.
• Check for Ground Issues:: Ensure that all ground connections related to the ignition and tachometer circuits are secure and free of corrosion.
• Consult the Service Manual:: Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the tachometer and ignition system.
• Professional Diagnosis:**
• If the issue persists after performing the above steps, consider seeking assistance from a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the cause of the B1367 code.