Fixing a Subaru P1718 Code: Solutions and Reset Procedure

A Guide to Subaru P1718 Code and Reset Procedure

This code relates to the transmission control system, and understanding what it signifies, its causes, and how to fix it can save you from potential headaches and costly repairs. In this article, we’ll delve into the Subaru P1718 code, exploring what it means, its symptoms, common causes, and the steps required to fix it.

What is the P1718 Code?

A Subaru P1718 code is a generic powertrain code that

The problem inhibitor switch

indicates a problem with the Transmission Control Module (TCM) communication circuit. The P1718 trouble code is defined as AT Can communication circuit. The CAN bus is the vehicle’s digital communications circuit, and when it’s down, you most likely can’t communicate with the modules using a scan tool.

This is a relatively common problem in Subarus and can sometimes be fixed using the Subaru P1718 reset procedure shown below. However, if you try that and it still has the code or won’t start, your problem is most likely in the inhibitor switch (most people call it the neutral/safety switch) on the right side of the transaxle.

Perform a Subaru P1718 code reset procedure

A logic lock in the computer sometimes causes this. It’s like your laptop freezing up and you having to reboot. So here’s the Subaru “reboot” procedure.

1) Disconnect the positive and negative battery terminals. Let the vehicle sit for at least an hour (if not overnight).
2) Touch the two cable terminals together to drain the capacitors in the ECM. Then, touch them together a second time.3) Reconnect both terminals to the battery posts and immediately use the keyless remote to lock and unlock the doors.
4) Get in the vehicle and turn the key to the RUN position. The dash gauges will sweep up and then down. Turn the key to OFF. Repeat this FOUR times.

Try starting the vehicle. If it starts, you successfully rebooted the CAN bus.

If not, you’ll have to do the full Subaru P1718 diagnostic procedure.

Subaru Inhibitor Switch Recall

If you own a 2021 Crosstrek, 2022 Forester or 2021-23 Legacy or Outback, Subaru has issued a recall on the inhibitor switch that causes a  Subaru P1718 code. Contact a Subaru dealer for more dealers on this recall.

Click on the image to download the full PDF of the Subaru inhibitor recall service bulletin

© 2020 Rick Muscoplat