OBD Codes List

Diagnostic reference · P28C8

P28C8

Clutch A Pump Motor Performance

System
Transmission (P code)
Lamp
Check Engine Light
Category
Powertrain - Transmission

What it means

P28C8 means Clutch A Pump Motor Performance.

Where it lives

For P28C8, start at the pump the description names.

Check these first

  • A weak clutch A pump motor
  • Contaminated fluid restricting the clutch A pump
  • A worn clutch A pump seal losing pressure
  • An internal leak in the clutch A pump circuit
  • Low fluid level starving the clutch A pump

What to do next

  1. Read clutch A pump motor data on a scan tool
  2. Check transmission fluid level and condition
  3. Command the clutch A pump and watch motor current and speed
  4. Inspect the clutch A pump for restriction or wear
  5. Replace the clutch A pump motor assembly if performance stays low
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.