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Home >> Chevrolet >> 2005 >> Chevy Express H1500, Van Passenger >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Trouble Shooting) >> Troubleshooting >> No Engine Braking - D1

No Engine Braking - D1

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No Engine Braking - D1

Checks Cause
Rear Band (657) Damaged, worn, or not anchored
Rear Band Apply Pin (73) The pin is too short or is binding in the case.
Piston (65) The piston is binding in the case.
Seal (66) Worn or damaged
Cover (62) Damaged
Gasket (63) Damaged or missing
Bolt (61) Loose, broken, or missing
Checkball
  • Missing
  • Damaged
  • Not sealing
  • Incorrect size
Fluid Pressure Too low
Output Shaft (671) The shaft or the splines are broken.
Mainshaft (662) The shaft or the splines are broken.
Thrust Washer (218) Worn or damaged
Bushing (234) Worn or damaged