P0258 Mercedes-Benz Code - Injection Pump Fuel Metering Control 'B' Low
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
- P0258 Mercedes-Benz indicates Injection Pump Fuel Metering Control 'B' Low.
- 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 P0258 Mercedes-Benz 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 P0258 Mercedes-Benz?
- 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 P0258 Mercedes-Benz?
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 P0258 Mercedes-Benz 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 P0258 Mercedes-Benz Code
1. What are the common symptoms of OBDII code P0258 in a Mercedes-Benz related to the Injection Pump Fuel Metering Control 'B' Low?
- Common symptoms include engine misfires, rough idling, loss of power, and poor fuel efficiency.
2. What are the possible causes of OBDII code P0258 in a Mercedes-Benz?
- The code P0258 can be triggered by issues such as a faulty fuel metering control valve, clogged fuel filter, low fuel pressure, or a wiring issue.
3. How can I diagnose the OBDII code P0258 in my Mercedes-Benz?
- Diagnosis typically involves using a scan tool to retrieve the code, checking the fuel system components for any visible issues, and testing the fuel pressure to identify the root cause.
4. What are some repair tips for resolving OBDII code P0258 in a Mercedes-Benz?
- Repair tips may include replacing the fuel metering control valve, cleaning or replacing the fuel filter, checking and correcting fuel pressure levels, and inspecting and repairing any damaged wiring.
5. Is it safe to continue driving with OBDII code P0258 in my Mercedes-Benz?
- It is not recommended to continue driving with code P0258, as it can lead to further engine damage and decreased performance. It's best to address the issue promptly.
6. Can a DIY enthusiast fix OBDII code P0258 in a Mercedes-Benz?
- While some aspects of diagnosing and repairing the issue may be tackled by a DIY enthusiast, dealing with fuel system components and electrical connections should be left to professional mechanics to ensure safety and proper resolution.
7. How much does it typically cost to repair OBDII code P0258 in a Mercedes-Benz?
- The cost of repairs for code P0258 can vary depending on the exact cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.
8. Will resetting the OBDII code P0258 in my Mercedes-Benz make it go away permanently?
- Resetting the code may temporarily clear the warning light, but if the underlying issue causing code P0258 is not addressed, the code is likely to reappear once the problem persists.
9. Can a Mercedes-Benz continue to run smoothly with OBDII code P0258 unresolved?
- Ignoring and running the vehicle with code P0258 unresolved can lead to poor engine performance, reduced fuel efficiency, and potential long-term damage to engine components.
10. How important is it to address OBDII code P0258 promptly in a Mercedes-Benz?
- Promptly addressing code P0258 is crucial to maintaining the performance and longevity of your Mercedes-Benz, as ignoring the issue can lead to more severe problems and higher repair costs in the future.
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