P1248 – OBD-II DTC

OBD-II DTC P1248 – Second Fuel Pump Faulty or Ground Fault

DTC P1248 meaning

DTC P1248 indicates a problem with the second fuel pump in a vehicle. This code is triggered when the Engine Control Module (ECM) detects a fault related to the second fuel pump’s operation or its electrical ground circuit. The second fuel pump is typically used to provide additional fuel pressure, especially in high-demand situations, such as during acceleration or under heavy load.

DTC P1248 symptoms

Common symptoms associated with DTC P1248 may include:

• Engine performance issues, such as hesitation or stalling
• Reduced fuel efficiency
• Difficulty starting the engine
• Check Engine Light illuminated
• Unusual noises from the fuel pump area

DTC P1248 causes

Several factors can lead to the triggering of DTC P1248, including:

• Faulty second fuel pump
• Electrical issues, such as damaged wiring or connectors
• Ground faults in the fuel pump circuit
• Faulty fuel pump relay
• Issues with the ECM or its programming

DTC P1248 seriousness

DTC P1248 can be considered serious as it may affect the vehicle’s fuel delivery system. If left unaddressed, it can lead to poor engine performance, increased emissions, and potential engine damage. It is advisable to diagnose and repair the issue promptly to ensure safe and efficient vehicle operation.

How to diagnose DTC P1248

To diagnose DTC P1248, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the second fuel pump and its wiring for visible damage.
3. Check the fuel pump relay for proper operation.
4. Test the electrical connections for continuity and ground.
5. Measure the voltage at the fuel pump while the engine is running.
6. Perform a functional test of the second fuel pump.

How to fix DTC P1248 step-by-step instructions

To fix DTC P1248, follow these step-by-step instructions:

1. Disconnect the battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors related to the second fuel pump.
3. Replace the second fuel pump if it is found to be faulty.
4. Test and replace the fuel pump relay if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Start the engine and monitor for any reoccurrence of the DTC.

How to erase DTC P1248

To erase DTC P1248, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the DTC menu on the scanner.
4. Select the option to clear or erase the DTCs.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the engine to ensure the DTC does not return.

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