What is OBD-II Code P2AAE – Diesel Fuel Presence Sensor Circuit Low

What is OBD-II Code P2AAE – Diesel Fuel Presence Sensor Circuit Low

As a mechanic, I understand how frustrating it can be when your vehicle’s check engine light turns on and you don’t know what’s causing it. One of the more common OBD-II codes for diesel engines is P2AAE – Diesel Fuel Presence Sensor Circuit Low. Let me explain what this code means and how to repair the issue.

What is OBD-II Code P2AAE?

OBD-II codes are diagnostic trouble codes that are standardized across all vehicles produced after 1996. P2AAE is a specific trouble code that indicates the diesel fuel presence sensor circuit is reading low. This sensor is responsible for detecting the level of fuel in the fuel tank and sends a signal to the vehicle’s computer system. The computer then calculates how much fuel is needed to power the engine. When this circuit is reading low, it means the sensor is not detecting enough fuel in the tank.

What Causes OBD-II Code P2AAE?

There are several reasons why the diesel fuel presence sensor circuit may be reading low and causing the P2AAE code to appear. One reason is a faulty sensor. The sensor may be malfunctioning and not detecting the fuel level properly. Another reason may be a wiring issue. The wiring that connects the sensor to the computer system may be damaged, causing the signal to be weak or lost altogether. Lastly, the fuel tank may be damaged, causing it to leak fuel, which would cause the sensor to read low.

How to Repair OBD-II Code P2AAE?

To repair OBD-II Code P2AAE, first, the fuel tank needs to be inspected for any damages that could cause fuel to be lost. If there are no damages, then the fuel level sensor needs to be tested. The sensor can be tested by performing a resistance check using a multimeter. The sensor should have a specific resistance range, and if the reading is outside of that range, the sensor has failed and needs to be replaced.

If the resistance check is within the correct range, then the wiring needs to be checked for any damages. If a wiring problem is detected, it needs to be repaired or replaced. In some cases, the wiring can become disconnected from the sensor or the computer system, causing the sensor to read low.

Overall, the repair process involves identifying the issue and replacing any faulty components or repairing any damaged wiring. It’s important to note that this process should be completed by a trained mechanic with the proper tools and equipment.


1. What are some symptoms of OBD-II Code P2AAE?
– Some common symptoms of OBD-II Code P2AAE include a check engine light, reduced fuel efficiency, and difficulty starting the engine.

2. Is it safe to drive with OBD-II Code P2AAE?
– Generally, it’s not recommended to drive with an OBD-II code present. It’s best to have the issue repaired as soon as possible to avoid any further damage to the vehicle.

3. Can I repair OBD-II Code P2AAE myself?
– While it’s possible to repair some issues yourself, it’s recommended that you seek the assistance of a trained mechanic to properly diagnose and repair the issue.

4. How much does it cost to repair OBD-II Code P2AAE?
– The cost to repair OBD-II Code P2AAE can vary depending on the extent of the damage and the cost of replacement parts. It’s best to get a quote from a mechanic before proceeding with any repairs.

5. Can OBD-II Code P2AAE cause other issues with my vehicle?
– OBD-II Code P2AAE can cause reduced fuel efficiency, which can lead to increased emissions and potential damage to the engine over time if left unchecked. It’s best to have the issue repaired as soon as possible to avoid any further issues.

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