The P0228: Throttle/Pedal Position Sensor/Switch C Circuit High Input indicates an issue where the voltage in the throttle or pedal position sensor C circuit is higher than expected. This can lead to improper throttle response, reduced engine performance, or even engine stalling. The problem may stem from a high voltage condition in the sensor circuit, a faulty sensor, wiring or connector issues, or a malfunction in the Powertrain Control Module (PCM). When this code appears, it signifies that the sensor is receiving too much voltage, which can disrupt the vehicle’s throttle control system.
P0228 – Quick Overview
| Meaning | P0228: Throttle/Pedal Position Sensor/Switch C Circuit High Input |
| Is it serious? | Yes, this code is serious as it can cause poor throttle response, engine performance issues, and potentially unsafe driving conditions. Prompt diagnosis and repair are recommended. |
| Possible causes | – High voltage in the throttle/pedal position sensor C circuit – Faulty throttle/pedal position sensor C – Wiring issues such as shorts or opens – Faulty PCM |
| How to diagnose? | – Test the throttle/pedal position sensor C for proper operation. – Check for high voltage in the sensor circuit. – Inspect the wiring and connectors for defects. – Replace or repair any faulty components. |
P0228 Meaning
The P0228: Throttle/Pedal Position Sensor/Switch C Circuit High Input code signifies that the vehicle’s computer has detected a higher-than-normal voltage in the throttle or pedal position sensor C circuit. This elevated voltage can cause the sensor to send incorrect signals to the vehicle’s computer, leading to erratic throttle behavior, reduced engine performance, or stalling. Possible reasons for this issue include a malfunctioning sensor, electrical shorts in the wiring, faulty connectors, or issues within the Powertrain Control Module (PCM) itself.
Step-by-step Diagnostic Guide
Follow the procedure below to diagnose and resolve the P0228 code by systematically eliminating potential causes.
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to identify any additional related codes that might provide further insights into the problem. | OBD-II Scanner |
| Measure Voltage in Sensor Circuit | Using a multimeter, measure the voltage in the throttle/pedal position sensor C circuit to ensure it is within the manufacturer’s specified range. | Multimeter, Vehicle’s Service Manual |
| Inspect Throttle/Pedal Position Sensor C | Examine the sensor for signs of damage or malfunction. Ensure it operates smoothly and responds correctly to throttle inputs as per specifications. | Multimeter, Manufacturer’s Specifications |
| Check Wiring and Connectors | Inspect the wiring harness and connectors associated with the sensor for any signs of shorts, opens, corrosion, or damage that could cause high voltage. Pay special attention to areas where wiring may be exposed to heat or moving parts. | Flashlight, Multimeter, Wiring Diagram |
| Perform a Wiggle Test | Gently wiggle the wiring and connectors while monitoring the sensor’s voltage to identify any intermittent high voltage conditions caused by loose or damaged connections. | Multimeter, Circuit Tester |
| Inspect the PCM | If the sensor and wiring appear to be functioning correctly, inspect the Powertrain Control Module for any faults or issues. This may require professional diagnostic tools or assistance. | OBD-II Scanner, Multimeter |
| Repair or Replace Faulty Components | Based on the diagnosis, repair or replace any identified faulty components such as the throttle/pedal position sensor C, damaged wiring, faulty connectors, or the PCM if necessary. | Replacement Parts, Basic Hand Tools |
| Clear the Code and Test Drive | After completing repairs, use the OBD-II scanner to clear the P0228 code. Take the vehicle for a test drive to ensure that the issue has been resolved and that the code does not return. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Following the test drive, re-scan the vehicle to confirm that the P0228 code has been cleared and does not reappear. If the code returns, further diagnosis may be required to identify additional issues. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko