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Engine-Codes – Generic – P079D

P079D Code - Transmission Friction Element 'D' Slip Detected

Quick Answer

The P079D diagnostic trouble code indicates that the transmission friction element 'D' is slipping. Common causes include Worn clutch plates, Low transmission fluid levels, Faulty transmission solenoids. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P079D indicates Transmission Friction Element 'D' Slip Detected.
Common causes
Common causes include Worn clutch plates, Low transmission fluid levels, Faulty transmission solenoids.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P079D Description

The P079D diagnostic trouble code indicates that the transmission friction element 'D' is slipping. This can occur when the transmission is unable to maintain the proper level of friction between the clutch plates, leading to inefficient power transfer and potential drivability issues. When the friction element 'D' slips, it can cause erratic shifting, hesitation, reduced acceleration, and overall poor performance.

OBDII Code P079D - Transmission Friction Element 'D' Slip Detected
P079D Code - Transmission Friction Element 'D' Slip Detected

Common Causes of P079D

  1. Worn clutch plates
  2. Low transmission fluid levels
  3. Faulty transmission solenoids
  4. Malfunctioning transmission control module (TCM)
  5. Electrical issues within the transmission system

Symptoms of P079D

  1. Erratic shifting
  2. Hesitation when accelerating
  3. Reduced power and acceleration
  4. Transmission slipping
  5. Check Engine Light illuminating

How to Fix P079D

  1. Perform a thorough inspection of the transmission system to identify the specific cause of the slipping friction element 'D'.
  2. Replace worn clutch plates and ensure proper clutch adjustment.
  3. Check and refill transmission fluid to the correct level.
  4. Test and replace faulty transmission solenoids if necessary.
  5. Reset the TCM and clear the diagnostic trouble codes to ensure proper operation.

Cost to Fix P079D

The cost of repairing a transmission friction element 'D' slip issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, the repair costs for this issue can range from $500 to $1500, including parts and labor. However, it is important to note that labor rates and diagnosis time can vary significantly based on the location, vehicle make and model, and the type of engine. It is recommended to consult with a professional mechanic or auto repair shop for a more accurate cost estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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