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OBD Code P218D

Throttle/Fuel Inhibit B Circuit Low

CodeP218D
DescriptionThrottle/Fuel Inhibit B Circuit Low
SystemAir Metering

What Does P218D Mean?

Throttle/Fuel Inhibit B Circuit Low. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the air metering.

Code Breakdown

P = Powertrain code

2 = Manufacturer-specific

How to Fix P218D

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check the TPS connector for corrosion, bent pins, or a loose connection.
  2. Test TPS voltage with a multimeter at closed throttle (typically ~0.5V) and wide open (~4.5V).
  3. Slowly open the throttle and verify voltage increases smoothly without dropouts.
  4. If voltage is erratic or out of range, replace the throttle position sensor.
  5. Check the 5V reference signal from the ECM.
  6. Clear codes and verify smooth throttle operation during a test drive.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P218D serious?

The severity depends on the underlying cause. Some triggers for P218D are minor (like a loose gas cap), while others may indicate a more significant problem. We recommend having the code diagnosed with a proper scan tool to determine the exact cause before deciding on urgency.

Can I clear P218D myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P218D?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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