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OBD Code P1654

Service Throttle Soon Lamp Control Circuit (Buick)

CodeP1654
DescriptionService Throttle Soon Lamp Control Circuit (Buick)
SystemAir Metering

What Does P1654 Mean?

Service Throttle Soon Lamp Control Circuit (Buick). 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

1 = Manufacturer-specific

How to Fix P1654

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

  1. Inspect the throttle body for carbon buildup. Clean with throttle body cleaner if dirty.
  2. Check the throttle position sensor (TPS) connector and wiring.
  3. Test TPS voltage with a multimeter — should smoothly increase from closed to open (typically 0.5V to 4.5V).
  4. Check the electronic throttle actuator motor for proper operation.
  5. Inspect the accelerator pedal position sensor (APP) and its wiring.
  6. If the throttle body has a motor that does not respond, the throttle body assembly may need replacement.
  7. After any throttle body service, the ECM may need a throttle body relearn procedure.
  8. Clear codes and test throttle response.

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 P1654 serious?

The severity depends on the underlying cause. Some triggers for P1654 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 P1654 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 P1654?

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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