P2068 OBD-II Trouble Code: Fuel Level Sensor “B” Circuit High

P2068 trouble code definition

Fuel Level Sensor “B” Circuit High

What the P2068 code means

This code indicates the fuel level sensor is indicating a higher than expected voltage. The higher the value the more fuel is in the tank.

What causes the P2068 code?

If your tank was full as you leave for a long trip, the voltage reading should decrease as the fuel in the tank is used. Each manufacturer will vary slightly, but the method for setting this code is the same. While driving a preprogrammed distance, the PCM expects to see a drop in fuel level, if the fuel level drops less than a specified amount, this DTC will be set.

What are the symptoms of the P2068 code?

• The owner will likely become aware of the Check Engine Light first.

• If the driver is paying attention, they will likely notice the fuel gauge hasn’t moved as far as it should.

• It is possible the fuel sender will still be working but out of the specification of what the PCM expects.

How does a mechanic diagnose the P2068 code?

As with any Check Engine Light, a mechanic should first connect a scanner checking for codes and review the relevant data. In this case he/she would be looking at the voltage reading from the fuel tank level sender. Ideally, the mechanic would remove or add fuel to the tank and watch to see if the voltage reading changes accordingly.

Often times it is challenging to remove fuel from the fuel tank and adding fuel will only make replacing the sender much more difficult due to the added weight. Often it is more time effective to remove the fuel tank, remove the fuel sender and actuate it manually while watching the fuel gauge, and scan data.

In the process of removing the tank, it is advisable to check the fuel pump module’s electrical connector for damage or other signs of a bad electrical connection. If one is found, the connector should be replaced. It is common for a replacement or upgrades connector to be included with a fuel pump module.

Common mistakes when diagnosing the P2068 code

If a vehicle is using this code, it will have two fuel tanks. The extra fuel tank is for extra capacity or the size of the tank was to large to fit into a single cavity. If this is the case, the size of one tank will be split into two. Because there are two tanks, it is very easy to mistake which tank this code is referring to. Extra time should be spent to insure the correct sender is being removed.

How serious is the P2068 code?

The code is only serious because of the potential to run out of fuel. If you are on a long trip, most people won’t stop to have their Check Engine Light read if the vehicle is running ok. It’s possible the driver won’t realize the fuel gauge isn’t moving and keep driving until it is too late. Aside from running out of gas, this code poses no other problems to the vehicle.

What repairs can fix the P2068 code?

The most common fix for this code is the fuel level sending unit. On some vehicles, depending on the year make and model, it is necessary to replace the fuel pump and sender as a unit. Even if the fuel pump isn’t failing, the tank removal is time consuming and challenging, so replacing the fuel pump at this time is a good choice for preventative maintenance.

Additional comments for consideration regarding the P2068 code

Fuel level sending units are common failures with all manufacturers. Vehicles with the most common failures are Chevy trucks and SUV’s, followed by Dodge and Ford. Of all the fuel pumps I have replaced, I have replaced more Chevy truck fuel pumps and senders than any other. Asian and European vehicles seem to do better as far as fuel senders and fuel pumps are concerned.

Need help with a P2068 code?

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