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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1004 (Automatic Transmission - 4L80-E/4L85-E (Troubleshooting)) >> Troubleshooting >> No Engine Braking - D1

No Engine Braking - D1

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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