All codes/P079A

P079A

Transmission Friction Element A Slip Detected

High severity

Friction element A (the first clutch or band in the gear matrix) shows measurable slip while it should be fully engaged. Detected by comparing input/output speed sensors against the commanded gear ratio. Slip means the element cannot transmit full torque — risk of glazing the friction surfaces.

Friction element A (the first clutch or band in the gear matrix) shows measurable slip while it should be fully engaged. Detected by comparing input/output speed sensors against the commanded gear ratio. Slip means the element cannot transmit full torque — risk of glazing the friction surfaces.

Common causes

  • Worn friction discs in element A

    One of the most commonly reported causes for this code — check this first.

    high

    Typical part cost: $660-4400

  • Low hydraulic pressure to element A

    A plausible cause — test and verify before replacing parts.

    medium

    Typical part cost: $660-4400

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First things to check

  1. 1Confirm the code with a scan tool and check for additional related codes.
  2. 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P079A mean?

P079A means "Transmission Friction Element A Slip Detected". It is a generic OBD-II code that points to a fault in the transmission.

What are the most common causes of P079A?

worn friction discs in element a; low hydraulic pressure to element a; old atf lacking friction modifier — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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