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P258D - OBD Trouble Code

OBD Code P258D - Vacuum Pump Control Circuit High

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The pump operates constantly if the engine is on, so wear and tear will eventually cause it to fail. When this happens, you’ll notice a reduction in braking performance. If your vehicle uses the vacuum pump to operate the AC, you’ll also notice that you aren’t able to maintain a consistent temperature in the cabin. OBD code P258D means Vacuum Pump Control Circuit High Issue.

Learn More About OBD Error Code P258D

An internal combustion engine running on unleaded gasoline builds up a tremendous amount of pressure inside the enclosed crankcase. This pressure is used to power multiple belts and pulleys ranging from alternators to AC units, but is released thanks to the use of a vacuum pump. A diesel engine on the other hand relies on vacuum pumps to provide power for other systems, most notably the brake system and in many cases, the air conditioning system. The vacuum pump operates continuously as each cylinder inside the engine continues to fire. When the vacuum pump goes bad or fails entirely, it can significantly impact the overall performance and operation of a vehicle.

 

Since the vacuum pump is always in use, the likelihood of experiencing some sort of mechanical failure or entire breakage is more likely on diesel engines that utilize this component. The most common cause of vacuum pump failure occurs due to broken belts, electrical problems inside the unit, or vacuum hoses that fail. On a gasoline powered vehicle, the vacuum pump tends to impact the emissions or exhaust system; however, if not properly maintained, it can cause significant damage to cylinder head components.

 

What causes this problem with the Vacuum Pump Control Circuit High?

 

  • Wiring of vacuum pump control circuit is open or short
  • Electrical connections to the EVP are faulty
  • Faulty or damaged vacuum pump pressure sensor
  • Circuit fuse of the sensor is blown
  • ECM/PCM fault or failure

Replace/Repair These Parts To Fix OBD Code P258D

  1. Engine Control Module - Dead cells in batteries can cause a failure in the engine control module. Many times, a battery is left in the rig long after a cell has died. This would affect the grounding in the car battery.
  2. Powertrain Control Module - If there are some faults in the PCM, then it may throw off the timing and fuel settings of the engine, which can negatively affect the performance. A flawed PCM may cause the vehicle to experience a reduction in fuel efficiency, power as well as acceleration.
  3. Electronic Control Unit - Do you know that the poor performance or unexplained drops in fuel economy or efficiency are often associated to onboard car computer problems, or defective ECU issues?
  4. Diagnostic Tools - Use factory grade diagnostic tools to resolve OBD code P258D error. Buy new diagnostic tools and equipment for us.
  5. Vacuum Pump - If your AC unit stops working all of the sudden, it might be caused by a vacuum pump, especially in diesel applications. If you notice a problem with your AC unit, but it's been recently serviced, contact a local mechanic to inspect your vacuum pump for any issues.
  6. Vacuum Pump Repair Kit - Make use of quality vacuum pump repair kit to resolve problems related to leakages and other repairs. Buy new repair kit from us now!
  7. Vacuum Pump Belt - The most common cause of vacuum pump failure occurs due to broken belts, electrical problems inside the unit, or vacuum hoses that fail. Thus, replace damaged pump belt now!


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Symptoms Of OBD Error Code P258D

If you are facing OBD error code P258D, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

 

Common Symptoms

 

  • Decrease in fuel economy due to increased fuel consumption
  • Air conditioning system inoperative
  • Oil and vacuum leaks from the pump
  • Check Engine light indication on

How To Correct P258D Vacuum Pump Control Circuit High

After you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is few common steps to correct this issue with your vehicle.

 

  • Damaged vacuum hose replacement
  • Defective vacuum pump replacement
  • Defective pump relay replacement
  • Corroded or burnt wiring and connector replacement

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of Pcm, Vacuum Pump, Fuel Shutoff Switch, Exhaust Gas Temperature Sensor, Vacuum Pump Relay and many more. Now all your problems would vanish within no time.

Easy Diagnosis Of Engine Error OBD Code P258D

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P258D code to be stored:

 

  • The diagnosis starts with a complete visual inspection of the vacuum pump, as well as its wiring and harness.
  • Check for bare wires, especially those entering the vacuum sensor circuit. These wires can be stained and worn out and cause shorts. It is important that all wires are away from the exhaust. Also, any damaged wires need to be replaced.
  • The highest rate of failure for Code P258D is of the vacuum pump and it is quickest to check the resistance of the circuit first. Every manufacturer notifies the specified amount of resistance that each pressure sensor should have. If the resistance measured falls out of the specified range, then the sensor is deemed to be faulty and is needed to be replaced.
  • In the next step, the wiring for the pump control circuit is checked and examined along with the harness for any signs of damage. Most probable cause of damage is usually debris on the road that gets under the car and damages the wiring.
  • Other things that can damage the wiring is from rodents or harnesses being incorrectly routed during other repairs, causing the wires to rub through and get short out.
  • Measure the resistance of the wiring running from the powertrain control module to the sensor and if the resistance is more than the limit, there is probably a problem with the circuit. At this point, the simplest solution is to replace the wire from end to end.
  • After checking all of the above the final inspection come the point of checking the powertrain control module for faults and reprogram, if needed.

Common Mistakes When Diagnosing the P258D Code

 

  • Replacing the vacuum pump without doing proper diagnosis and check for faults in other components
  • Also check for faulty wiring and harness in association to the sensor and circuits

Other Diagnostic Codes Related To OBD Code P258D

P258A - Vacuum Pump Control Circuit/Open

P258B - Vacuum Pump Control Range/Performance

P258C - Vacuum Pump Control Circuit Low

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