The P2068 code is a generic OBD-II diagnostic trouble code indicating “Fuel Level Sensor ‘B’ Circuit High.” It means the powertrain control module detected an abnormally high voltage in the secondary fuel level sensor circuit.
This code does not automatically prove the sensor has failed. Diagnosis requires checking the wiring for opens or shorts and testing the sensor resistance before replacing any components.
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Key Takeaways
- The P2068 code indicates the control module detected a high voltage condition or open circuit in the secondary fuel level sensor circuit.
- Possible causes include a failed fuel level sending unit, damaged wiring, corroded connectors, or an open circuit in the harness.
- Diagnosis involves inspecting the fuel tank harness, checking for pinched wires, and measuring the sensor’s internal resistance.
- Repairs may involve repairing the wiring harness, cleaning connectors, or replacing the confirmed failed fuel level sensor.
P2068 Code Description and Implications
The P2068 code indicates that the powertrain control module detected a high voltage condition on the fuel level sensor “B” circuit. This applies to vehicles equipped with dual fuel tanks or saddle-style tanks.
The primary fuel level sensor is designated as “A,” while the secondary sensor in the opposite tank or side of the saddle tank is designated as “B.”
When the module detects voltage remaining high when it should be low, or detects an open circuit, it stores this code. This is an electrical fault, not a physical fuel leak.
Common Causes of the P2068 Code
Damage to the wiring harness or corroded connectors at the secondary fuel level sensor can cause this code. An open circuit or a short to voltage in the signal wire will prevent the module from reading correctly.
An internally failed fuel level sensor sending unit can create an open circuit condition, causing the control module to detect high voltage on the signal line.
In vehicles with saddle tanks, the wiring harness routing between the tanks or across the frame rail is susceptible to physical damage, chafing, or moisture intrusion.
In some instances, an internal fault within the powertrain control module itself may prevent it from properly reading the sensor circuit.
Symptoms Associated With P2068
An illuminated Check Engine Light is expected once the monitor detects the circuit fault. MIL behavior varies by application, but the light commands when the electrical fault is verified.
The prominent symptom is an inaccurate or completely inoperative fuel gauge. The dashboard may display empty, full, or fluctuate erratically because the module cannot calculate the total fuel volume.
Because this is an electrical circuit code for a monitoring component, you will likely not experience any drivability symptoms, engine performance issues, or changes in fuel economy.
Diagnosing the P2068 Trouble Code
Diagnosis must begin by confirming the exact factory definition and checking for related error codes. Record freeze-frame data to see the conditions when the code set.
Perform a thorough visual inspection of the wiring harness and connectors at the secondary fuel tank or sensor location. Look for chafed wires, broken insulation, corrosion, or loose pins.
Use a multimeter to test the signal circuit for continuity, shorts to voltage, and open circuits according to the manufacturer wiring diagram. Verify that the sensor is receiving proper reference voltage and ground.
Measure the internal resistance of the fuel level sensor sending unit. Compare the reading to the manufacturer specification to determine if the sensor is internally open.
Repairing the P2068 Issue
Repairs must follow confirmed diagnosis. If the wiring harness is found to be broken, shorted, or corroded, repair the circuit and secure the harness to prevent future damage.
If electrical testing confirms the fuel level sensor is internally open or fails the manufacturer resistance test, replace the sending unit using a component meeting the exact vehicle specification.
If a broken connector pin is found, replace the connector pigtail and seal it properly to prevent future moisture intrusion.
Cost Considerations for P2068 Repairs
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Repairing damaged wiring or replacing an externally mounted sensor involves moderate parts and labor expenses.
If the sensor is integrated into the fuel pump module inside the fuel tank, the tank must be lowered or removed, which increases labor hours and overall repair costs.
Prevention Strategies for Future Occurrences
Inspecting exposed fuel tank wiring harnesses and connectors during routine under-vehicle checks can help identify developing insulation damage or moisture intrusion before it causes an open circuit.
Keeping connector seals intact and ensuring wiring is properly secured away from hot exhaust components or moving suspension parts may reduce the risk of circuit faults.
Some electrical failures occur due to normal component aging and cannot be reliably prevented through standard maintenance.
Troubleshooting Tips and Best Practices
Do not attempt to fix a P2068 code by simply replacing the fuel pump or primary sensor. This code specifically targets the secondary “B” sensor circuit.
Always verify the reference voltage and ground circuits at the sensor connector before condemning the sensor itself. A missing ground will mimic an open circuit or high voltage condition.
Check for technical service bulletins for your exact vehicle application, as some manufacturers release updated wiring harness pigtails or revised sensor designs to address chronic connector corrosion.
More OBD-II Codes
| P2014 | P2022 | P2033 | P2035 |
| P2048 | P2066 | P2070 | P2072 |
| P2073 | P2074 | P2076 | P2078 |
| P0462 | P0463 | P0001 | P0172 |
| P0171 | P0174 | P0300 | P0420 |
| P0440 | P0446 | P0455 | P0456 |
Frequently Asked Questions
Is the P2068 code generic or manufacturer-specific?
The P2068 code is a generic SAE OBD-II diagnostic trouble code. However, the exact design of the dual fuel tank system and diagnostic steps vary by manufacturer and vehicle application.
Will a P2068 code affect my engine performance?
No. This code indicates an electrical fault in the fuel level monitoring circuit. It affects the dashboard fuel gauge reading but does not alter fuel delivery or engine drivability.
Can I drive my vehicle with a P2068 code?
You can typically drive the vehicle, as this code causes no drivability issues. However, you must manually track your mileage to avoid running out of fuel due to the inaccurate gauge.
Does a P2068 code mean I need a new fuel pump?
Not necessarily. While the sensor is often part of the fuel pump module, the code can be caused by damaged wiring or corroded connectors. Proper circuit testing is required first.
Can I clear the P2068 code without fixing the problem?
Clearing the code only resets the warning light. If the underlying wiring fault or failed sensor remains, the monitor will detect the high voltage condition immediately and turn the light back on.
What Should You Do About the P2068 Code?
Confirm the exact factory definition and check for related circuit codes for your specific vehicle application. Follow the applicable manufacturer diagnostic procedure to verify whether the fault lies in the wiring, connectors, or the secondary fuel level sensor itself.
Once testing confirms the root cause, repair or replace the confirmed failed component, then retest the system to ensure the fuel gauge reads accurately.
