How to Fix P1272 Cylinder #7 High to Low Side Short

Introduction

If you’re experiencing the P1272 error code on your vehicle, it means that there is a problem with the cylinder #7 high to low side short. This can be a frustrating issue to deal with, but fortunately, it’s something that can be fixed with a little bit of know-how and some basic tools. In this article, we’ll walk you through the steps you need to take to fix this problem and get your vehicle running smoothly again.

Step 1: Check the Wiring

The first thing you should do when you encounter the P1272 error code is to check the wiring. This error code is often caused by a short circuit in the wiring, so it’s important to make sure that all of the wires are properly connected and in good condition. Start by inspecting the wiring around cylinder #7 and look for any signs of damage or wear. If you notice any issues, you’ll need to replace the damaged wires.

Step 2: Check the Injector

If the wiring looks good, the next step is to check the injector. The injector is responsible for delivering fuel to the cylinder, and if it’s not working properly, it can cause the P1272 error code. To check the injector, you’ll need to use a multimeter to test the resistance. If the resistance is outside of the manufacturer’s specifications, you’ll need to replace the injector.

Step 3: Check the Fuel Pressure

Another possible cause of the P1272 error code is low fuel pressure. If the fuel pressure is too low, the injector won’t be able to deliver enough fuel to the cylinder, which can cause the error code. To check the fuel pressure, you’ll need to use a fuel pressure gauge. If the pressure is too low, you may need to replace the fuel pump or the fuel filter.

Step 4: Check the PCM

If none of the above steps have resolved the issue, the problem may be with the powertrain control module (PCM). The PCM is responsible for controlling the fuel injection system, and if it’s not working properly, it can cause the P1272 error code. To check the PCM, you’ll need to use a diagnostic tool to read the error codes and check for any other issues. If the PCM is the problem, you’ll need to replace it.

Conclusion

Fixing the P1272 error code can be a bit of a challenge, but with the right tools and some basic knowledge, it’s something that you can do yourself. By following the steps outlined in this article, you should be able to identify and fix the problem, and get your vehicle running smoothly again.

FAQs

1. Can I drive my vehicle with the P1272 error code?

It’s not recommended to drive your vehicle with the P1272 error code. This error code indicates a problem with the fuel injection system, which can cause damage to your engine if left unchecked.

2. How much does it cost to fix the P1272 error code?

The cost of fixing the P1272 error code will depend on the cause of the problem. If it’s a simple wiring issue, it may only cost a few dollars to fix. However, if the problem is with the injector or the PCM, it could cost several hundred dollars to repair.

3. Can I fix the P1272 error code myself?

Yes, you can fix the P1272 error code yourself if you have some basic knowledge of automotive repair and the right tools. However, if you’re not comfortable working on your vehicle, it’s best to take it to a professional mechanic.