OBD Codes List

Diagnostic reference · P2856

P2856

Clutch B Pressure Charge Performance

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

What it means

P2856 means Clutch B Pressure Charge Performance.

Check these first

  • A clutch B that charges slower than commanded
  • A restricted clutch B feed passage
  • A failed clutch B pressure sensor
  • A worn clutch B pack

What to do next

  1. Read clutch B pressure on a scan tool
  2. Command a clutch B apply and watch the pressure rise
  3. Check transmission fluid level and condition
  4. Test the clutch B feed passage for a restriction
  5. Replace the clutch B pressure sensor if the charge stays slow
  6. Clear the code and retest

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Updated

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