P258D - OBD Trouble Code
OBD Code P258D - Vacuum Pump Control Circuit High
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
- 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.
- 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.
- 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?
- Diagnostic Tools - Use factory
grade diagnostic tools to resolve OBD code P258D error. Buy new diagnostic
tools and equipment for us.
- 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.
- 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!
- 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