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OBD Code P1720

Vehicle Speed Meter Circuit Malfunction (Ford)

CodeP1720
DescriptionVehicle Speed Meter Circuit Malfunction (Ford)
SystemSpeed/Idle

What Does P1720 Mean?

Vehicle Speed Meter Circuit Malfunction (Ford). This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the speed/idle.

Code Breakdown

P = Powertrain code

1 = Manufacturer-specific

How to Fix P1720

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 vehicle speed sensor (VSS) connector and wiring.
  2. Test the VSS with a multimeter or oscilloscope.
  3. Inspect the drive gear on the transmission output shaft (if applicable).
  4. Check the ABS wheel speed sensors — the ECM may use these as a VSS backup.
  5. Replace the VSS if faulty.
  6. Clear codes and verify the speedometer reads correctly 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 P1720 serious?

The severity depends on the underlying cause. Some triggers for P1720 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 P1720 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 P1720?

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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