P0251 Audi Code - Injection Pump Fuel Metering Control 'A' Malfunction
Quick Answer
This fault code is stored in the Engine Control Module (ECM) when the system cannot correctly control the fuel pressure. Common causes include Faulty Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0251 Audi indicates Injection Pump Fuel Metering Control 'A' Malfunction.
- Common causes
- Common causes include Faulty Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0251 Audi Description
Normally manufacturers will support data parameters for actual and desired fuel pressure.
A number of issues may cause this fault code to be set such as a faulty fuel rail pressure sensor, a mechanical fault with a fuel inlet metering valve could cause the valve to become stuck. An electrical fault such as an open circuit in the fuel inlet metering valve on a system with a normally closed valve will also cause this situation. A short circuit on the control wire of a normally open fuel pressure regulator will also cause this fault.
A fault in the fuel injector return system will cause the fuel pressure to be lower than expected. This causes fuel from the high-pressure circuit to be leaked back to the low-pressure circuit. A faulty maximum pressure relief valve will also cause this situation.
The high-pressure pump should also be tested to ensure it is capable of delivering the required volume of fuel.
What are the Possible Causes of the DTC P0251 Audi?
- Faulty Fuel Pump
- Fuel Pump harness is open or shorted
- Fuel Pump circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0251 Audi?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0251 Audi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0251 Audi Code
1. What are the common symptoms of OBDII code P0251 in an Audi?
- Common symptoms include rough idling, decreased engine performance, difficulty starting the vehicle, and potentially black smoke coming from the exhaust.
2. What does the OBDII code P0251 in an Audi indicate?
- The code P0251 indicates a malfunction in the fuel metering control 'A' of the injection pump.
3. What are the possible causes of OBDII code P0251 in an Audi?
- Possible causes include a faulty fuel metering control 'A', issues with the injection pump, wiring or connector problems, or a clogged fuel filter.
4. How can I diagnose the cause of OBDII code P0251 in my Audi?
- Diagnosing the issue may involve checking the wiring and connectors for any damage, testing the fuel metering control 'A' for proper functioning, and inspecting the injection pump for any signs of wear or damage.
5. Is it safe to continue driving with OBDII code P0251 in my Audi?
- It is not recommended to continue driving with this code as it can lead to further damage to the engine and decrease in overall performance.
6. Can I repair OBDII code P0251 in my Audi myself?
- Repairing this code may require specialized tools and knowledge, so it is recommended to have a professional mechanic diagnose and fix the issue.
7. How much does it typically cost to repair OBDII code P0251 in an Audi?
- The cost of repairing this code can vary depending on the extent of the issue and the labor rates of the mechanic, but it can range from a few hundred to a few thousand dollars.
8. Are there any preventative maintenance tips to avoid OBDII code P0251 in an Audi?
- Keeping up with regular maintenance, such as changing the fuel filter at recommended intervals, can help prevent issues that may trigger this code.
9. Can a faulty fuel injector cause OBDII code P0251 in an Audi?
- While a faulty fuel injector may not directly cause this specific code, it can contribute to issues with fuel delivery and affect the overall performance of the injection system.
10. Will resetting the OBDII code P0251 in my Audi make the issue go away?
- Resetting the code may temporarily turn off the check engine light, but the underlying issue causing the code will still need to be addressed to prevent further problems.
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