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P2068 – What Does It Mean and How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

P2068 is an OBD-II Code that refers to Fuel Level Sensor B Circuit High Input

Meaning

A P2068 code is a diagnostic trouble code related to that occurs when the PCM/ECM detects a high input voltage from the fuel level sensor. This code is usually caused by a bad or corroded sensor, wiring issue, or short to ground. The fuel level sensor (sender) is usually located within the fuel tank, which is essential to the fuel pump module. A float is linked to an arm that travels inside of a resistor that is grounded to the tank, frame, or has a dedicated ground circuit. When the fuel level in the tank varies, so does the ground path in accordance with voltage supplied.

The PCM looks for a drop in fuel level while driving a preprogrammed distance; if the quantity drops beneath a certain amount, this DTC P2068 will be set and stored.

Causes

Common causes for this code include:

  • Faulty Fuel Level Sensor B
  • Harness is open or shorted for Fuel Level Sensor B
  • Circuit has poor electrical connection for Fuel Level Sensor B 
  • Bad Engine Control Module (ECM) rare

Symptoms

The symptoms of a P2068 code are:

  • Illuminated Check Engine Light
  • The fuel level gauge could move erratically or read ” empty” or “full.”
  • Alarm may sound if the fuel light blinks on.

Diagnosis

To diagnose a P2068 DTC code, a technician would:

  1. Scan for codes in the ECM and look at the freeze frame data for failure.
  2. Visually inspect the wiring and connectors for damage.
  3. Check for an open or short in the circuit.
  4. Measure the input voltage at the fuel level sensor.

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a P1361 code:

  • Not thoroughly inspecting all the wiring and connectors for damage.
  • Not checking the input voltage at the fuel level sensor.
  • Not clearing the codes and driving the vehicle to see if the code returns.

How serious is this?

A P2068 code is a low to moderate severity code. It will usually not cause any drivability problems, but it should be addressed as soon as you may not be able to gauge the fuel level accurately.

What repairs can fix the code?

The following are solutions that may fix this problem:

  • Repair or replace any wiring that is damaged
  • Replace the fuel level sensor and in some cases the pump too
  • Reprogram the PCM

Related codes

A P2068 is related to and may be accompanied by the following codes:

P0171- System Too Lean

P0172- Fuel System Too Rich

P0300- Misfire Detected Random Cylinders

Conclusion

In conclusion, the P2068 code is a diagnostic trouble code that refers to a problem with the fuel level sensor. Common causes of this code include a faulty sensor, wiring issue, or short to ground. The code will usually cause the Check Engine Light to come on and may result in an inaccurate fuel level gauge. keep in mind, the code is usually low to moderate severity, but should be addressed as soon as possible.