B1368 Ignition Tach Circuit Open

How to Fix B1368 Ignition Tach Circuit Open


If you’re experiencing issues with your car’s ignition system, specifically the B1368 code, you’re not alone. This code indicates that there is an open circuit in the ignition tach circuit, which can cause a variety of problems, including difficulty starting your car, poor fuel efficiency, and even engine damage. Fortunately, fixing this issue is relatively straightforward, and with a few basic tools and some know-how, you can get your car back on the road in no time.

Step-by-Step Guide

Step 1: Check the Wiring

The first thing you should do when you encounter the B1368 code is to check the wiring. Start by inspecting the wiring harness that connects the ignition coil to the powertrain control module (PCM). Look for any signs of damage, such as frayed wires or loose connections. If you find any issues, repair or replace the damaged wiring as needed.

Step 2: Check the Ignition Coil

If the wiring looks good, the next step is to check the ignition coil. Start by disconnecting the coil from the wiring harness and measuring the resistance across the primary and secondary windings. Consult your car’s manual for the specific resistance values, as they can vary depending on the make and model of your vehicle. If the resistance values are outside of the recommended range, replace the ignition coil.

Step 3: Check the PCM

If the wiring and ignition coil both check out, the problem may be with the PCM. Start by checking the PCM’s power and ground connections to ensure they are secure and free of corrosion. If the connections look good, use a scan tool to check for any error codes related to the PCM. If you find any issues, replace the PCM as needed.

car vertical

Useful Tips

– Always consult your car’s manual for specific instructions and recommended values.
– Use a multimeter to measure resistance and voltage accurately.
– If you’re not comfortable working on your car’s ignition system, consider taking it to a professional mechanic.


Fixing the B1368 code may seem daunting, but with a little patience and some basic tools, you can get your car back on the road in no time. Remember to always follow safety precautions when working on your car, and don’t hesitate to seek professional help if you’re unsure about any aspect of the repair process.


1. What causes the B1368 code?

The B1368 code is caused by an open circuit in the ignition tach circuit, which can be due to a variety of issues, including damaged wiring, a faulty ignition coil, or a malfunctioning PCM.

2. Can I drive my car with the B1368 code?

While it’s technically possible to drive your car with the B1368 code, it’s not recommended. Ignoring this issue can lead to further damage to your car’s engine and decreased fuel efficiency.

3. How much does it cost to fix the B1368 code?

The cost of fixing the B1368 code can vary depending on the cause of the issue and the make and model of your vehicle. In general, you can expect to pay anywhere from $100 to $500 for parts and labor.