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OBD Code P0802

Transmission Control System MIL Request Circuit/Open

CodeP0802
DescriptionTransmission Control System MIL Request Circuit/Open
Possible CausesTCM cannot request MIL|Communication issue
SymptomsNo warning of transmission faults
SystemTransmission

What Does P0802 Mean?

Transmission Control System MIL Request Circuit/Open. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the transmission.

Code Breakdown

P = Powertrain code

0 = Generic (SAE standard)

How to Fix P0802

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 transmission control module (TCM) connector for corrosion or damage.
  2. Inspect CAN bus wiring between the TCM and ECM.
  3. Check battery voltage and charging system.
  4. Verify the TCM has proper power and ground.
  5. Try clearing codes — if they return, the TCM may need reprogramming or replacement.

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 P0802 serious?

The severity depends on the underlying cause. Some triggers for P0802 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 P0802 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 P0802?

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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