The P2555: Throttle/Fuel Inhibit Circuit High refers to a problem in the throttle or fuel inhibit circuit where the voltage or signal level is higher than expected. This could be due to a faulty control module, wiring problems, or issues with connectors that lead to excessive voltage, which can affect the vehicle’s throttle and fuel regulation.
P2555 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P2555: Throttle/Fuel Inhibit Circuit High |
| Is it serious? | Yes, as high voltage in this circuit can lead to improper fuel and throttle management, potentially causing drivability issues, unintended acceleration, or safety risks. |
| Possible causes | – High voltage or signal in the throttle/fuel inhibit circuit – Faulty throttle or fuel inhibit control module – Wiring or connector issues |
| How to diagnose? | – Measure the voltage in the throttle/fuel inhibit circuit – Inspect and test the throttle or fuel inhibit control module – Check wiring and connectors – Replace faulty components if needed |
P2555 Meaning
The P2555: Throttle/Fuel Inhibit Circuit High code indicates that there is a high voltage condition within the throttle or fuel inhibit circuit. This can happen due to an internal issue with the throttle/fuel inhibit control module, a wiring short to power, or poor electrical connections. This condition may cause improper throttle response or fuel management, potentially resulting in unstable vehicle behavior.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to determine if there are any other related codes that may help in diagnosing the issue. Additional codes can provide context for the problem. | OBD-II Scanner |
| Measure Voltage in Throttle/Fuel Inhibit Circuit | Use a multimeter to measure the voltage in the throttle/fuel inhibit circuit. Compare the measurement against manufacturer specifications to verify if it is excessively high. | Multimeter |
| Inspect the Throttle/Fuel Inhibit Control Module | Perform a visual inspection of the control module for signs of overheating, corrosion, or physical damage. Test the control module using a diagnostic tool to ensure it is operating within the correct voltage range. | Diagnostic Tool, Flashlight |
| Check Wiring and Connectors | Inspect all wiring and connectors related to the throttle/fuel inhibit circuit for any signs of short circuits, loose connections, or corrosion. Look for any spots where wires might be in contact with other metallic surfaces, causing shorts. | Flashlight, Multimeter |
| Repair or Replace Faulty Wiring/Connectors | Repair any wiring that shows signs of damage or replace faulty connectors to ensure a proper and stable electrical connection. This will help in reducing excessive voltage. | Basic Tools, Replacement Parts |
| Replace Faulty Control Module | If the control module is determined to be faulty after testing, replace it. Excessive voltage often points to internal failure within the module that needs to be resolved. | Replacement Throttle/Fuel Inhibit Control Module |
| Clear the Code and Test Drive | After completing the necessary repairs, use an OBD-II scanner to clear the fault code. Conduct a test drive to ensure proper throttle and fuel management and that the code remains cleared. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the vehicle to confirm that the P2555 code has not returned. If the code reappears, further diagnostic testing will be required to isolate any remaining issues. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
