What is OBD-II Code P2A79 – Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic?
OBD-II Code P2A79 is a diagnostic trouble code that indicates an error in the Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic. This code is commonly found on vehicles that have alternative fuel systems, such as those that run on compressed natural gas or propane. The circuit involved is responsible for measuring the pressure of the hydraulic fuel pump, which is crucial to the engine’s operation.
When this circuit is faulty, it will trigger a check engine light, indicating that there is a problem with the hydraulic fuel system. If not addressed, this issue can lead to reduced fuel efficiency, engine misfires, and even complete engine failure. In this article, we will explore the common causes of code P2A79, the symptoms of this code, and the steps you can take to repair it.
Causes of OBD-II Code P2A79 – Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic:
1. Hydraulic Fuel Pump Issues:
A faulty hydraulic fuel pump can cause various issues, including P2A79 code. It can cause pressure to drop, resulting in an intermittent or erratic signal from the pressure sensor, causing the engine to misfire, rough idle, and poor fuel economy. A broken or damaged hydraulic fuel pump can also cause the engine to shut down entirely, necessitating a complete pump replacement.
2. Wiring Faults:
Faulty wiring or damaged connections can also cause intermittent or erratic signals from the hydraulic fuel pump pressure sensor. This may occur if the wires are damaged or if the connectors are corroded or loose. Repairing the wiring faults can generally resolve the problem.
3. Failed Sensor:
If the sensor that measures the hydraulic fuel pump’s pressure fails, it can cause intermittent or erratic readings, resulting in code P2A79. The sensor may be damaged or have failed, causing engine performance issues and the triggering of the check engine light.
Symptoms of OBD-II Code P2A79 – Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic:
– Check engine light warning.
– Reduced fuel efficiency.
– Engine misfires.
– Rough idle.
– Poor engine performance.
– Engine has trouble starting.
Solutions to OBD-II Code P2A79 – Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic:
1. Check for Hydraulic Fuel Pump and Wiring Faults:
Check the hydraulic fuel pump and wiring faults to ensure that the connections are tight and free of corrosion. Address any issues immediately, and if necessary, replace the hydraulic fuel pump.
2. Check the Sensor:
Inspect the hydraulic fuel pump pressure sensor for any signs of damage or wear. If the sensor is damaged or inoperable, replace it.
Frequently Asked Questions:
1. Can I drive my vehicle with an OBD-II Code P2A79 – Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic?
It is generally not recommended to drive your vehicle while it has a P2A79 code. The code indicates that the hydraulic fuel pump pressure sensor is malfunctioning, which can cause engine performance issues and reduced fuel efficiency. Driving your vehicle with this code can worsen the issue and lead to more significant problems in the future.
2. How much does it cost to repair OBD-II Code P2A79 – Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic?
The cost to repair P2A79 varies depending on the cause of the problem. Replacing wiring can cost between $50 to $200, while replacing a sensor or hydraulic fuel pump can cost between $200 to $800.
3. What happens if I don’t repair OBD-II Code P2A79 – Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic?
If the OBD-II Code P2A79 is not resolved, it can result in reduced fuel efficiency, engine misfires, rough idle, and engine failure.
4. How can I prevent OBD-II Code P2A79 – Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic?
Regular maintenance, checks, and inspections can prevent or alleviate this issue. If you are experiencing the symptoms associated with P2A79, take your vehicle to a trusted mechanic immediately.
5. Can I reset the code myself?
Yes. To clear the P2A79 code, you can disconnect the battery for a few minutes or use an OBD-II scanner to clear the code. However, it’s essential to resolve the root cause of the problem before clearing the code to prevent it from happening again.
Conclusion:
When it comes to OBD-II Code P2A79, understanding the possible causes and symptoms is crucial. By addressing the root cause of the issue promptly, you can prevent or reduce engine performance issues, reduce fuel consumption, and save on costly repairs in the long run. If you are unsure about the cause of the code or how to repair it, you should consult an experienced mechanic.
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