P2068 Fuel Level Sensor B Circuit High Input

OBD-II DTC Datasheet

High signal level in the fuel level sensor circuit "B"

What does this mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles. Although general, specific repair steps may differ depending on the brand / model.

The fuel level sensor (gauge) is located in the fuel tank, usually an integral part of the fuel pump module. They usually cannot be replaced without replacing the fuel pump module, although there are exceptions. Attached to the arm is a float that moves along a resistor that is grounded to the tank, frame, or has a dedicated ground circuit. Voltage is applied to the sensor and the ground path changes depending on the fuel level. How much voltage depends on the system, but 5 volts is not uncommon.

As the fuel level changes, the float moves the lever and changes the resistance to ground, which changes the voltage signal. This signal can go to the fuel pump computer module or directly to the instrument cluster module. Depending on the system, the fuel pump computer module can only monitor ground resistance and then transmit fuel level information to the dashboard. If the fuel level signal to the fuel pump module (or instrument cluster module or PCM (powertrain control module)) exceeds 5 volts for a specified period of time, then the module that monitors the fuel level circuit will set this DTC.

Refer to the specific vehicle repair manual for the location of the "B" chain.

Relevant Fuel Level Sensor B Fault Codes include:

P2065 Fuel Level Sensor "B" Circuit Malfunction
P2066 Fuel Level Sensor "B" Circuit Range / Performance
P2067 Low input of the fuel level sensor circuit "B"
P2069 Fuel Level Sensor "B" Circuit Intermittent

symptoms

Symptoms of a P2068 trouble code may include:

Mil (malfunction indicator lamp) is on
The fuel gauge may deviate from the norm or show empty or full
The fuel level indicator may light up and beep.

reasons

Possible causes of a P2068 code include:

The fuel sensor signal circuit is open or shorted to B + (battery voltage).
Ground circuit is open or ground circuit may have high resistance due to rust or lack of grounding tape on fuel tank.
Damage to the fuel tank can cause problems in the fuel level circuit.
Open in the fuel lever sensor resistor to ground
Possibly faulty instrument cluster
It is less likely that the PCM, BCM, or fuel pump computer module has failed.

Possible solutions

Fuel pump sensors typically last for the life of the fuel pump. Therefore, if you have this code, do a visual inspection of the fuel tank and wiring harness. Look for damage to the tank, indicating a shock that could damage the fuel pump or sensor. Look for a missing grounding strap or a rusty ground where the fuel tank is grounded to the frame. Check the harness connector for damage. Repair if necessary. Find out which system you have and verify that voltage is present at the fuel level sensor in the fuel pump harness. If not, repair open or short circuit in wiring.

Performing a voltage drop test on the ground circuit can determine if there is a high resistance path in the ground circuit. This can be done by using a voltmeter and connecting one lead to the battery ground terminal and the other lead to the fuel gauge ground on the tank. Turn on the key (it is desirable that the engine is running). Ideally, it should be 100 millivolts or less (1 volt). A value close to 1 volt indicates a current problem or an evolving problem. If necessary, repair / clean the “mass” of the fuel level sensor. It is possible that the instrument cluster has failed internally or on the circuit board (if applicable). It is very difficult for non-professionals to test them. But if you have access to the electrical circuitry, you can remove the cluster and see the damaged circuitry if it is located on the PCB, but otherwise you will need a scan tool that will interact with the instrument cluster.

An easy way to test the fuel level circuit is to make sure the fuel level sensor is properly grounded at the fuel tank connector. With the key on the fuel gauge should go to one extreme or another. Complete removal of the ground path should cause the pressure gauge to behave in reverse. If the sensor fires, you know that the wiring that supplies voltage and ground to the fuel level sensor is good and that the instrument cluster is most likely OK. A likely suspect would be the fuel level sensor itself. The fuel tank may need to be removed to gain access to the fuel pump module in the tank. Failure of the PCM or BCM (Body control module) is not impossible, but unlikely. Don't suspect it in the first place.

Related DTC discussions

Dodge Journey P2010 2068I had 2010 different codes on my 12 Dodge Journey and the new computer was delivered to the dealer if it was flashed and well, except for the code p02068 which was never there before the new computer was installed and left the dealer with that code ...
P2065 is P2068 2005 Kia Sorento 2.5L CRDI TurboHello There 2005 Kia Sorento CRDI 2.5L Turbocharged Diesel on 245000 km watch. After replacing a new nozzle, copper oil seals, the motor ran for 10-15 minutes, gradually slowed down and stopped. Attempts to start the engine were unsuccessful, but turned over many times without starting. Fault code for cylinder 2 P2065 and cylinder 3 P2068 Can ...

Need more help with your p2068 code?

If you still need help with DTC P2068, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.