P0123 - OBD Trouble Code
Obd code P0123 - Throttle Position Sensor/Switch A Circuit High Input
Circuit Low Input codes read when there
is a low battery voltage (that does come with many possible outcomes), where
negative connections are being sent across electrical connectors or earlier
fixed wiring, including damage in electrical connections.
Learn More About OBD Error Code P0123
Low input voltages are the result of other possible causes that include insufficient poor installation of aftermarket parts, bad quality aftermarket parts like fuses, relays and switches, and moderation of the electrical system that may come with using conductors not valued for use for a certain application. Regardless, negative connections frequently cause high resistances in some of the circuit’s parts, making it crucial to execute resistance and progressive checks during the procedure of diagnosis.
What causes this problem with the Throttle Position Sensor/Switch A Circuit High Input?
- Not
securely mounting TPS
- Short
circuit TPS to ground or another wire
- Defected
TPS
- Corroded
computer (PCM)
Replace/Repair These Parts To Fix OBD Code P0123
- Boost Pressure Sensor - If the boost
pressure sensor delays, you will find the boost is losing power and your engine
is decreasing in effectiveness. If there is corrosion to your boost pressure
sensor, you should replace it to turn away possible efficiency loss in your
turbocharged car.
- Turbocharger
- The turbocharger might falter by low oil levels,
to which excess heat and friction will ultimately disintegrate the bearings
that are inside.
This gives the conclusion you need to replace the turbocharger or use
internal lubricants to ensure the parts are moving effectively.
- Supercharger
- A supercharger can begin to get faulty for a
wide range of reasons, for example supercharger oil at low level, fragmented
pulley, and seals/gaskets that are overheated and faltered. If your car's
supercharger is not performing correctly, you need to replace it immediately.
- Knock Sensor
- When detecting a knock sensor, make sure there
are no damaged terminal, nor any damaged wires and connections. A defective
knock sensor decreases your car’s performance, effects the fuel economy and
hikes up the costs of engine damage, so it’s important to get the correct knock
sensor for your kind of car make.
- Spark Plug
- A flawed spark plug may happen in the process of
slow acceleration, power loss, declining fuel economy, engine misfires, and
complications starting the car. I this case, it’s highly required to replace
your spark in your engine every 30 months or 30,000 miles your car is running.
- Intake Manifold
- A intake manifold that is leaking can put harmful
effects on your car's engine, pushing the manifold to suck in excess air from
outside through the leak, causing more air to access intake ports and delay the
air-fuel relation in the cylinders. It’s strongly advised to replace the
defective manifold as soon as possible to keep your car’s engine from getting
further damaged.
- Boost Pressure Gauge - If the boost pressure gauge is starting to fail,
any signs of reduction of boost power can be viewed and engine begins to lose its effectiveness. If your
boost pressure sensor is clearly damaged, it should be replaced to prevent your
turbocharged car from losing its efficiency.
- Powertrain Control
Module - A defective PCM
will make your car fail to start or begin to stall when running. Additionally,
downward emissions would happen due to the failure of controlling the emissions
system, so if your PCM is not performing correctly, you should have it replaced
instantly.
- Engine Control
Module - Your vehicle might not start even after
ensuring that the battery and starter are working effectively. If your car's
problems wind down to a defective engine control module, it should be replaced
as soon as possible to stop further serious risks to your vehicle.
- Wastegate
- If too much exhaust gas is channeled through the
turbine, the unit can over accelerate, which puts mechanical stress on it and
can cause to all sorts of problems, for example fragmented shafts, faltering
compressor wheels, or an upswing to the internals and power delivery in the
engine. It’s appropriate to customize the turbo on its own and replace an
upscale version with one designated for the project.
Symptoms Of OBD Error Code P0123
Symptoms that are compatible with a defected throttle position sensor include: Pausing or staggering upon speed capacity, wobbly idle, and a brightened check engine light. In other cases, a result might even be a no-start condition.
Common Symptoms
- Rough or low idle
- Stalling
- Surging
- No/little
acceleration
- Other symptoms
may also be present
How To Correct P0123 Throttle Position Sensor/Switch A Circuit High Input
The OBD Code P0123 problems can be fixed with some of these common solutions for your particular car engine;
- If having a scan
tool to access, see what functionality the idle and WOT (wide open throttle)
readings bring for the TPS. Detect if they're close to the identifications
brought up from above. If not the case, then exchange the TPS and re-examine.
- Detect for an
irregular open or short voltage within the TPS signal. To achieve this, you
should not use a scan tool. What you'll need is an oscilloscope. The reason
this occurs is because scan tools take up samples of many different readings
just over one or two data lines and can miss an irregular drop out. It is best
to hook up the oscilloscope and watch for the signal. It should brush up and
down nicely without dropouts or spikes.
- If you don’t
notice problems, then carry out a wiggle test. You can achieve this by wiggling
the connector and harness as you watch the pattern. Does it successfully drop
out? If does so, exchange TPS and re-detect.
- If you don’t have
a TPS signal, then check at the connector for 5 Volt references. If presently
in view, detect the ground circuit for open or shorts.
- Ensure that the signal circuit is not 12V. It shouldn’t ever have battery voltage. If so, trace the circuit for short to voltage and fix.
View for any sign of water in the connector and exchange TPS as needed.
Easy Diagnosis Of Engine Error OBD Code P0123
It’s wise to always check diagnostic scanner in advance for your particular car. You may have an issue with your engine that can easily be sought out by the repairman to fix that can save you the expense during this diagnosis.
- Reading and
recording the codes retrieved and observing the freeze frame data to see when
the P0123 code was set.
- Erasing the
OBD-II error codes and re-examining the car to see if the P0123 code returns.
- Looking to detect
all TPS connections and wiring for any loose or damaged items.
- Collating the
data between TPS circuit A and B on the scanner and if not correct,
- executing the TPS pinpoint tests as for each of the manufacturer's proposals.
Common Mistakes When Diagnosing The P0123 Code
- A visual
inspection is not conducted first
- Codes are not
red, recorded, clearing or re-examined to confirm errors
- Exchanging a TPS
sensor before tests detect an issue
- Distinguishing TPS sensor A and B qualifications are not made before and after repair or replacements.