Feedback

P0123 - OBD Trouble Code

Obd code P0123 - Throttle Position Sensor/Switch A Circuit High Input

<<See All OBD Codes

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

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.

Other Diagnostic Codes Related To OBD Code P0123

P0120 - Throttle Position Sensor/Switch A Circuit Malfunction

P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem

P0122 - Throttle Position Sensor/Switch A Circuit Low Input

P0124 - Throttle Position Sensor/Switch A Circuit Intermittent