P1270 Cylinder #5 High To Low Side Short

How to Fix P1270 Cylinder #5 High to Low Side Short


If you’re experiencing the P1270 error code on your vehicle, it means that there is a problem with the cylinder #5 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: Diagnose the Problem

Before you can fix the problem, you need to diagnose it. The P1270 error code is usually caused by a short circuit in the wiring or a faulty fuel injector. To diagnose the problem, you’ll need an OBD-II scanner. Connect the scanner to your vehicle’s OBD-II port and read the error code. If the code is P1270, then you know that the problem is with cylinder #5.

Step 2: Check the Wiring

Once you’ve diagnosed the problem, the next step is to check the wiring. Start by inspecting the wiring harness for any signs of damage or wear. Look for frayed wires, loose connections, or any other signs of damage. If you find any issues, repair or replace the wiring as needed.

Step 3: Check the Fuel Injector

If the wiring looks good, the next step is to check the fuel injector. Start by disconnecting the fuel injector connector and measuring the resistance across the injector terminals. The resistance should be between 11 and 18 ohms. If the resistance is outside of this range, then the fuel injector is faulty and needs to be replaced.

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Step 4: Replace the Fuel Injector

If the fuel injector is faulty, then you’ll need to replace it. Start by removing the fuel rail and disconnecting the fuel injector from the fuel rail. Install the new fuel injector and reconnect the fuel rail. Be sure to torque the fuel rail bolts to the manufacturer’s specifications.

Step 5: Clear the Error Code

Once you’ve replaced the fuel injector, clear the error code using your OBD-II scanner. This will reset the vehicle’s computer and allow it to relearn the new fuel injector.

Step 6: Test Drive the Vehicle

After clearing the error code, take the vehicle for a test drive. Monitor the vehicle’s performance and watch for any signs of the P1270 error code. If the code doesn’t reappear, then you’ve successfully fixed the problem.


Fixing the P1270 error code can be a simple process if you know what you’re doing. By following the steps outlined in this article, you can diagnose and fix the problem with ease. Remember to always be safe when working on your vehicle and to consult a professional if you’re unsure about anything.


1. Can I drive my vehicle with the P1270 error code?

It’s not recommended to drive your vehicle with the P1270 error code. This code indicates a problem with the fuel injector, which can cause damage to your engine if left unchecked.

2. How much does it cost to fix the P1270 error code?

The cost to fix the P1270 error code will depend on the cause of the problem. If it’s a simple wiring issue, then the cost will be minimal. If it’s a faulty fuel injector, then the cost can range from $150 to $500.

3. Can I fix the P1270 error code myself?

If you have some basic mechanical knowledge and the right tools, then you can fix the P1270 error code yourself. However, if you’re unsure about anything, it’s always best to consult a professional.