P0123 Throttle Position Sensor / Switch A Circuit High Input

Technical description code P0123

P0123 - Throttle Position Sensor/Switch A Circuit High Input

What does trouble code P0123 mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles. Although general, specific repair steps may differ depending on the brand / model.

TPS (Throttle Position Sensor) is a potentiometer mounted on the throttle body. It determines the throttle angle. When the throttle is moved, the TPS sends a signal to the PCM (Powertrain Control Module), which is the main computer that controls the vehicle. Typically a 5-wire sensor: XNUMXV reference from PCM to TPS, ground from PCM to TPS, and signal return from TPS to PCM.

The TPS sends throttle position information back to the PCM over this signal wire. When the throttle is closed, the signal is about 45 volts. With WOT (Wide Open Throttle), the TPS signal voltage approaches the full 5 volts. When the PCM sees a voltage that is above the normal upper limit, P0123 is set.

WHEN DISCOVER CODE P0123?

Excessive voltage from the throttle position sensor (TPS) is sent to the engine control module (ECM).

Symptoms

Symptoms may include:

• Rough idle
• High idle speed
• Growing
• other symptoms may also be present

Causes of malfunction P0123

The P0123 code may mean that one or more of the following events have occurred:

• TPS is not securely attached
• TPS circuit: short to ground or other wire
• Defective TPS
• Damaged computer (PCM)
• Faulty Throttle Position Sensor
• Throttle position sensor harness is open or shorted.
• Throttle position sensor circuit poor electrical connection

Possible solutions

A good starting point is always to check the Technical Service Bulletins (TSB) for your particular vehicle. Your problem may be a known issue with a known manufacturer-released fix and could save you time and money while troubleshooting.

If there are no symptoms, the simplest thing is to reset the code and see if it comes back.

If there are symptoms such as motor tripping or wobbling, carefully inspect all wiring and connectors leading to the TPS. Most likely the problem is in the TPS wiring.

Check the voltage at the TPS (see your vehicle's service manual for this specific information). If the voltage rises sharply or becomes too high (more than 4.65V with the key on and the engine off), this indicates a problem. Carefully trace each wire of the TPS harness to check for breaks, rubbing against other components, etc.

Other DTCs associated with the TPS sensor and circuit: P0120, P0121, P0122, P0123, P0124

P0123 BRAND SPECIFIC INFORMATION

• P0123 ACURA Throttle Position Sensor/Switch "A" Circuit High Voltage
• P0123 AUDI Accelerator Pedal Position Sensor/Switch “A” Circuit High
• P0123 BUICK Throttle Position Sensor Circuit High
• P0123 CADILLAC Throttle Position Sensor Circuit High Voltage
• P0123 CHEVROLET Throttle Position Sensor Circuit High Voltage
• P0123 CHRYSLER Throttle Position Sensor / Throttle Position Pedal Circuit High Input
• P0123 DODGE Throttle/Throttle Position Sensor Pedal Position Circuit Input High Input
• P0123 FORD Throttle/Pedal Position Sensor Circuit High
• P0123 GMC Throttle Position Sensor Circuit High
• P0123 HONDA Throttle Position Sensor/Switch "A" Circ High Voltage
• P0123 HYUNDAI Throttle/Pedal Position Sensor "A" Position Sensor High Input
• P0123 INFINITI Throttle Position Sensor/Switch 1 Circuit High Input
• P0123 ISUZU Throttle Position Sensor 1 High Voltage
• P0123 JEEP Throttle Position Sensor/Throttle Pedal Position Input High
• P0123 KIA Throttle Position Sensor/Pedal Position Sensor “A” High Input
• P0123 LEXUS Throttle Position Sensor/Switch "A" Circ High Input
• P0123 MAZDA Throttle Circuit Sensor 1 High Input
• P0123 MERCEDES-BENZ Throttle/paddle position sensor/switch circuit high input
• P0123 MITSUBISHI Throttle Position Sensor Rapid Input
• P0123 NISSAN Throttle Position Sensor/Switch Circuit High Input '1'
• P0123 PONTIAC Throttle Position Sensor Circuit High Voltage
• P0123 SATURN Throttle Position Sensor Circuit High Voltage
• P0123 SCION Throttle Position Sensor/Switch "A" Circ High Input
• P0123 SUBARU Throttle Position Sensor/Switch “A” Circuit Input High
• P0123 TOYOTA Throttle Position Sensor/Switch “A” Circuit Input High
• P0123 VOLKSWAGEN Accelerator Pedal Position Sensor/Switch "A" High

ERROR CODE P0123 (EASY FIX)

Need more help with your p0123 code?

If you still need help with DTC P0123, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.