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OBD Code P1240

Injector Circuit Cyllinder 7 Intermittent (Buick)

CodeP1240
DescriptionInjector Circuit Cyllinder 7 Intermittent (Buick)
SystemFuel System

What Does P1240 Mean?

Injector Circuit Cyllinder 7 Intermittent (Buick). This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the fuel system.

Code Breakdown

P = Powertrain code

1 = Manufacturer-specific

How to Fix P1240

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

  1. Check fuel pressure with a fuel pressure gauge at the rail. Compare to factory spec.
  2. Listen for the fuel pump priming when turning the key to ON (should hum for 2 seconds).
  3. Inspect the fuel filter — replace if it has not been changed recently.
  4. Check fuel lines for kinks, leaks, or damage.
  5. Test the fuel pump relay and fuse.
  6. If pressure is low, the fuel pump may be failing and needs replacement.
  7. Clear codes and test drive to confirm proper fuel delivery under load.

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 P1240 serious?

The severity depends on the underlying cause. Some triggers for P1240 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 P1240 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 P1240?

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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