How to Fix P1235 Fuel Pump Low Speed Malfunction

Introduction

If you’re experiencing a P1235 fuel pump low speed malfunction, you’re not alone. This is a common issue that many car owners face. The good news is that it’s usually an easy fix that you can do yourself. In this article, we’ll walk you through the steps to diagnose and fix the problem.

What is P1235 Fuel Pump Low Speed Malfunction?

P1235 is a diagnostic trouble code (DTC) that indicates a problem with the fuel pump low speed circuit. This circuit is responsible for controlling the fuel pump’s speed when the engine is idling or running at low speeds. When this circuit malfunctions, it can cause a variety of issues, including poor fuel economy, rough idling, and stalling.

Diagnosing the Problem

The first step in fixing a P1235 fuel pump low speed malfunction is to diagnose the problem. Here’s how to do it:

Step 1: Check the Fuel Pump Relay

The fuel pump relay is responsible for sending power to the fuel pump. If the relay is faulty, it can cause the fuel pump to malfunction. To check the relay, locate it in the fuse box and remove it. Use a multimeter to test the resistance across the relay’s terminals. If the resistance is high or infinite, the relay is faulty and needs to be replaced.

Step 2: Check the Fuel Pump Fuse

The fuel pump fuse is responsible for protecting the fuel pump from electrical surges. If the fuse is blown, it can cause the fuel pump to malfunction. To check the fuse, locate it in the fuse box and visually inspect it. If the fuse is blown, replace it with a new one.

Step 3: Check the Fuel Pump Wiring

The fuel pump wiring is responsible for transmitting power to the fuel pump. If the wiring is faulty, it can cause the fuel pump to malfunction. To check the wiring, use a multimeter to test the resistance across the wiring’s terminals. If the resistance is high or infinite, the wiring is faulty and needs to be replaced.

Fixing the Problem

Once you’ve diagnosed the problem, it’s time to fix it. Here’s how to do it:

Step 1: Replace the Fuel Pump Relay

If the fuel pump relay is faulty, replace it with a new one. Make sure to use a relay that’s compatible with your car’s make and model.

Step 2: Replace the Fuel Pump Fuse

If the fuel pump fuse is blown, replace it with a new one. Make sure to use a fuse that’s compatible with your car’s make and model.

Step 3: Replace the Fuel Pump Wiring

If the fuel pump wiring is faulty, replace it with new wiring. Make sure to use wiring that’s compatible with your car’s make and model.

Conclusion

Fixing a P1235 fuel pump low speed malfunction is usually an easy fix that you can do yourself. By following the steps outlined in this article, you can diagnose and fix the problem quickly and easily.

FAQs

1. Can I drive my car with a P1235 fuel pump low speed malfunction?

It’s not recommended to drive your car with a P1235 fuel pump low speed malfunction. This can cause a variety of issues, including poor fuel economy, rough idling, and stalling.

2. How much does it cost to fix a P1235 fuel pump low speed malfunction?

The cost to fix a P1235 fuel pump low speed malfunction varies depending on the make and model of your car. In general, it can cost anywhere from $50 to $500.

3. How long does it take to fix a P1235 fuel pump low speed malfunction?

The time it takes to fix a P1235 fuel pump low speed malfunction varies depending on the severity of the problem. In general, it can take anywhere from 30 minutes to a few hours.