What is OBD-II Code P2A68 – Alternative Fuel Tank C Level Sensor Circuit Intermittent/Erratic

What is OBD-II Code P2A68 – Alternative Fuel Tank C Level Sensor Circuit Intermittent/Erratic?

As an automotive mechanic, one of the common issues that customers bring to my attention is a malfunctioning check engine light. And with modern-day car technology, the check engine light can detect a problem even before it affects the vehicle’s performance. One of the error codes that pop up is the P2A68 code, which indicates that the alternative fuel tank C level sensor circuit is intermittent or erratic.

To better understand this code, we need to break it down into simpler parts. The OBD-II code refers to the On-Board Diagnostic system that is in-built in most vehicles manufactured after 1996. The system continuously monitors the vehicle’s performance, detects problems, and sends out alerts through the check engine light. P2A68, on the other hand, is a specific diagnostic code that indicates the problem with the Alternative Fuel Tank C Level Sensor Circuit.

Alternative Fuel Tank C Level Sensor Circuit refers to a specific sensor circuit that works to detect and regulate the fuel level in alternative fuel tanks, such as propane and natural gas tanks. The circuit is responsible for reading and interpreting the signal from the level sensor and sending the information to the engine control module (ECM) for appropriate fuel management.

The P2A68 code indicates that there is an issue with the circuit’s functionality, and the sensor readings are not accurate due to an intermittent or erratic circuit. This error code can cause several problems in your vehicle’s functioning, including reduced fuel efficiency, reduced engine performance, and even stalling in extreme cases.

How to Repair P2A68 Code?

Like most car problems, the P2A68 code cannot be ignored and must be addressed promptly. Neglecting the issue can lead to further damage, expensive repairs, or worse, accidents. There are several steps you can take to repair the P2A68 code, depending on the severity of the problem and the diagnosis by your mechanic.

Step 1: Check the Fuel Tank Level Sensor Wiring

The first logical step that most mechanics take when dealing with the P2A68 code is to check the fuel tank level sensor wiring. The wiring can become damaged, and a short circuit can occur, leading to an erratic or intermittent signal. The mechanic may check the wiring for any breakages, disconnects, or corrosion, and repair or replace them as necessary.

Step 2: Check the Fuel Tank Level Sensor

If the wiring is intact, the mechanic will proceed to check the fuel tank level sensor itself. The level sensor is usually located within the fuel tank and can be accessed by removing the fuel tank or using a scanning tool. The mechanic will use a multimeter to measure the sensor’s resistance and determine if it is working correctly. If the sensor is faulty, it will need to be replaced entirely.

Step 3: Check the ECM

If both the wiring and the sensor are functioning correctly, the mechanic may check the Engine Control Module (ECM). The ECM is the computer that controls the vehicle’s electronic systems and the fuel management system. A faulty ECM can cause an erratic or intermittent signal by interfering with the circuit. If this is the case, the ECM may need to be reprogrammed or replaced.

Step 4: Clear the Error Code

Once the mechanic has identified and fixed the problem, they can clear the error code using a scanning tool. Clearing the code resets the vehicle’s computer and turns off the check engine light. The mechanic will also test the vehicle to make sure that the problem is resolved and that the P2A68 code does not reappear.

Frequently Asked Questions

1. What causes the P2A68 code?

The P2A68 code is usually caused by an issue with the fuel tank level sensor circuit’s wiring, the fuel tank level sensor itself, or the engine control module (ECM). Damage, wear, or corrosion can cause these components to malfunction.

2. What are the Symptoms of P2A68 Code?

When the P2A68 code is displayed, it usually causes a reduction in fuel efficiency, engine performance, and can trigger the check engine light. In extreme cases, it can also lead to stalling.

3. Can I Drive my Vehicle with a P2A68 Code?

It is not safe to operate your vehicle with the P2A68 code without first having it diagnosed and repaired by a mechanic. Driving with a malfunctioning sensor can lead to further damage, reduced performance, and even accidents.

4. What is the Cost of Repairing the P2A68 Code?

The cost of repairing the P2A68 code depends on the cause of the problem and the extent of the damage. In most cases, the cost of repairing the wiring or sensor ranges from $100 to $400, while replacing the ECM can cost up to $1,200.

5. How can I Prevent the P2A68 Code from Occurring?

You can prevent the P2A68 code from occurring by regularly maintaining your vehicle, replacing worn out parts, and following the manufacturer’s recommended maintenance schedule. Additionally, avoid overfilling or underfilling your fuel tanks, which can cause electrical issues with the fuel level sensor circuit.


In conclusion, the P2A68 code can be daunting for most drivers, but with the right diagnosis and repairs, it can be resolved quickly. Always seek a professional mechanic’s services when dealing with check engine light codes, as they have the experience and tools necessary for accurate diagnosis and repairs. Preventative maintenance is also crucial in avoiding this and other check engine light codes, ensuring that your vehicle functions at optimal levels at all times.

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