Troubleshooting Engine Codes: Is a Bad Fuel Pump to Blame?

Will Bad Fuel Pump Throw A Code?

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Have you noticed that your car dashboard displays an error code related to the engine? It is encountered by almost every car owner due to a number of reasons. The reasons are worn-out spark plugs, MAF sensor failure, defective or damaged catalytic converter, bad O2 sensors, etc. The question that is frequently asked is this: will a bad fuel pump throw a code?

The fuel pump is one of the major contributors to engine code appearance like all other causes. Sometimes the fuel pump can’t directly push the check engine light to come on but pump-related failure components do. Inappropriate air-fuel ratio, clogged fuel filters, and electrical faults in the pump can cause the engine code to appear.

In today’s guide, we’ll discuss some basic engine codes and why they appear in the dashboard. In addition, we explain how to troubleshoot engine codes that appear due to a faulty fuel pump. So get connected and minimize the hassle.

The Most Common Engine Error Codes And Reasons To Appear

There are several engine trouble codes displayed on the car’s dashboard due to multiple causes. When the fuel pump starts to fail or is already damaged, you encounter several codes. P0171 is a common engine trouble code that bothers you due to a bad fuel pump. They are  P0201, P0267, P0268, P0231, P0232, P0030, P0087, etc..

Now, we’ll try to find out the exact causes. Let’s know every single code in the following table.

Engine Trouble Code Due To Fuel Pump Failure Issue WithIdentification Or Possible Symptoms
P0201An issue with the fuel injector or faulty wiringEngine misfires
P0267Clogged fuel injectorEngine check engine light comes on
P0268The higher voltage coming from the cylinder 3 fuel injectors Engine runs roughly at idle
P0231Secondary circuit for the fuel pump caught up with low voltage.Engine stall or misfire
P0232The lower voltage on the fuel pump’s secondary circuit and power short on the relayEngine starting delay or not starting.
P0300Due to low fuel pressure or bad fuel injectors.Poor acceleration, and reduce fuel economy. 
P0087Fuel pressure below the specifications, fuel pump failure, restricted fuel lines, incomplete fuel pressure sensor reading.The vehicle stops suddenly while running.
P0171Due to lean or rich air-to-fuel ratio.The engine will stall suddenly

Open Disclaimer: The OBD II engine trouble codes vary from car’s make and model. So don’t bother yourself asking why this doesn’t match my car.

Troubleshooting the Engine Codes that Appear Due to Bad Fuel Pump

Troubleshooting the Engine Codes that Appear Due to Bad Fuel Pump

We break down each code troubleshooting separately that appears due to a faulty pump. Each code has a different troubleshooting technique. Hence, you should follow the below guide to get rid of every single code.

Code P0201 Troubleshooting:

Before entering the troubleshooting process, you should know the basic why this code comes and its identification. Already we discussed the basic thoughts in the above table. However, this common engine code is indirectly connected to the bad fuel pump.

How? See, this code comes due to faulty wiring or fuel injectors and these contribute to the fuel pump damage. In this case, you need to change the electrical wiring and connections. And also, check the injector resistance and fix them too.

Code P0267 Troubleshooting:

This code appears in the dashboard and tells you there is a problem in the engine computer system. Whenever the fuel injectors jam, they cannot deliver the right fuel to the internal combustion process which in turn causes the engine to run poorly.

As a result, you can’t get the highest performance from the engine. When this is the matter, you should change the entire fuel injector if you’re unable to clean it.

Code P0268 Troubleshooting:

The engine code p0268 means there is a higher voltage output coming from the cylinder III fuel injectors. When this code appears, understand your engine will run roughly soon or start to run roughly when idle.

To delete this code permanently, replacing the fuel injector is required.

Also, check the connector. If the connection is loose, tighten them. Over time, you may fail to solve the issue. In this case, it’s best to take your car to the garage so that technician can handle it. 

Code P0231 Troubleshooting:

This code indicates you have the wrong fuel pump relay or failed fuel pump. In this case, you should change the fuel pump relay and fuel pump itself to increase the fuel pressure. It is best if you take assistance from an expert before getting into the process.

Code P0232 Troubleshooting:

P0232 code appears due to a lack of power on the pump relay and voltage is low on the fuel pump’s secondary circuit. So if you want to get rid of this code, change the pump relay.

Code P0300 Troubleshooting:

Usually, the P0300 engine fault code comes when the fuel pressure is very low or fuel pump defection detects. This code appears due to a number of reasons including worn-out spark plugs, damaged camshaft sensor, airflow sensor defect, etc. if this happens, don’t worry.

There is a practical solution to fix this issue. First, scan the error code to ensure which cylinder is bad. Then, change the spark plugs and fuel pump.

Code P0087 Troubleshooting:

The P0087 code appears when the fuel lines get corroded or restricted. Also, incomplete fuel pressure reading tends to produce this engine code. However, fixing it is effortless. Just replace the fuel line, fuel pressure sensor, and entire fuel pump assembly.

Code P0171 Troubleshooting:

Code P0171 appears when the car’s computer detects an inappropriate A/F ratio. When the fuel pump gets damaged, it can’t mix the air and fuel accurately. This is why the air-fuel ratio can’t deliver appropriately to the engine.

Sometimes the air enters more than fuel which causes significant damage to the engine and ultimate performance. In this case, you should change the fuel pump assembly entirely.

Final Verdict

The fuel pump gets damaged due to many reasons. After some time, you’ll notice your engine gets damaged more quickly than normal. It happens because of a defective fuel pump. Over time you see engine trouble code on the car’s dashboard. Now, you may be wondering if a bad fuel pump throws a code.

Your concern isn’t unnecessary. The truth is a bad fuel pump causes the engine code to appear on the dashboard. Bad fuel sensors, fuel lines, low fuel pressure, fuel injector defection, etc. are the main culprit for throwing engine codes. We hope you find this guide helpful and minimize extra hassle in the future.

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