P0259 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
- P0259 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 P0259 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 P0259 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 P0259 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 P0259 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.
Need more information about the P0259 Mercedes-Benz code?
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Frequently Asked Questions about P0259 Mercedes-Benz Code
1. What are common symptoms of OBDII code P0259 on a Mercedes-Benz related to the Injection Pump Fuel Metering Control 'B' Low?
- Common symptoms include engine misfires, reduced engine performance, and an illuminated Check Engine Light.
2. What are possible causes of OBDII code P0259 on a Mercedes-Benz?
- Possible causes include a faulty fuel metering control actuator, wiring issues, a clogged fuel filter, or a malfunctioning fuel pump.
3. How can I diagnose the root cause of OBDII code P0259 on my Mercedes-Benz?
- A thorough diagnostic process involves checking the fuel metering control system, inspecting wiring for damage, testing fuel pressure, and ensuring proper fuel flow.
4. Can I drive my Mercedes-Benz with OBDII code P0259 present?
- It is not recommended to drive the vehicle with this code as it can lead to further engine damage and reduced performance. It's best to address the issue promptly.
5. What is the typical repair process for resolving OBDII code P0259 on a Mercedes-Benz?
- The repair process involves diagnosing the root cause, replacing faulty components such as the fuel metering control actuator, clearing the code, and verifying proper operation.
6. Are there any preventative maintenance tips to avoid OBDII code P0259 on my Mercedes-Benz?
- Regularly servicing the fuel system, using high-quality fuel, and addressing any engine performance issues promptly can help prevent this code from occurring.
7. Can a DIY enthusiast repair OBDII code P0259 on a Mercedes-Benz?
- While some may attempt to diagnose and repair this code themselves, it is recommended to seek assistance from a qualified mechanic or technician due to the complexity of the fuel system.
8. How much does it typically cost to repair OBDII code P0259 on a Mercedes-Benz?
- The cost of repair can vary depending on the root cause, parts needed, and labor rates. It's advisable to obtain quotes from reputable repair shops for an accurate estimate.
9. Will resetting the Check Engine Light resolve OBDII code P0259 on a Mercedes-Benz?
- Resetting the Check Engine Light may temporarily turn it off, but the underlying issue causing the code will still need to be diagnosed and repaired to prevent it from reoccurring.
10. Is OBDII code P0259 on a Mercedes-Benz a common issue?
- While it may not be as common as some other codes, instances of P0259 related to the Injection Pump Fuel Metering Control 'B' Low can occur in Mercedes-Benz vehicles, particularly in older models or those with high mileage.
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