Transmission repair manuals ZF 6HP21

Information about transmission ZF 6HP21

Speaking about how to repair automatic gearbox ZF 6HP21 we should note that among the most common breakdowns there are problems with control package.

ZF 6HP21 Transmission fluid change

Instructions for replacing ATF

  1. Drain ATF and pour a new ATF (green, G 060 162 A…).
  2. Follow indication gear in the instrument cluster, start the engine and release the parking brake.
  3. Set the selector in position D, press the accelerator pedal.
  4. In position D accelerate transmission to a maximum speed of 50 km / h.
  5. Press the brake pedal to slow down wheels up to speed 0 km / h.
  6. Switch the selector lever to ‘R’. Accelerate the wheels rotate up to 20 km / h.
  7. Press the brake pedal to slow down wheels up to speed 0 km / h.
  8. Again put the selector in position ‘D’ and repeat steps from 3 to 7, five times.
  9. Switch the selector to position ‘P’ and turn off the engine.
  10. Drain ATF and pour a new ATF (green, G 060 162 A…).


  1. Capacity:  Dry Fill Capacity – 9.4 Litres 
  2. Fluid type: ZF-LifeGuard Fluid 6 
  3. 1 Litre Part No: (S671 090 255)

ZF6HP21 Oil Service

Instructions for adaptive trip:

  1. Make preliminary trip to warm ATF to a temperature > 60 °C (ATF temperature mustn’t be > 100 °C).
  2. With the vehicle with an inoperative engine idling and the brake pedal is pressed the selector lever from N to D. Repeat this process five times. Follow the same steps, turning the selector from N to P.
  3. Move the vehicle so that there was switching from 1st to 2nd gear at minimum pressing the gas pedal, and then switch back to 2-1. Repeat the process five times.
  4. Move with a small load until the automatic transmission will not shift to the 6th gear and maintain this mode about 30-60 seconds. Let go of gas pedal. Repeat this cycle four times.

ZF6HP21 Transmission problems



Transmission parts scheme



ZF 6HP19

ZF 6HP21 Power FlowZF 6HP19 power flow

ZF 6HP21 Solenoids

ZF 6HP 19/21 solenoids

Parts for Rebuild ZF6HP21 Transmission

Solenoids and Valve Body

Torque Converter

Rebuild Kits


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