Hard shift from park to drive
Thread Starter
6th Gear
Joined: Nov 2005
Posts: 6
Likes: 0
From: Bartlett IL
Hard shift from park to drive
Hi everyone, I have this wierd problem. When I shift from park into drive the car shifts hard, like it wants to lung forward. Then from 1st to 2nd it shifts hard as well. Here is whats weird. I have no powertrain codes at all. I have other codes but nothing about the powertrain. Then, it doesn't happen all the time. It will do this for about a week then the car shifts perfect for like a month. Then back to it. The times it does it and does not do it is all different. Like right now, I have been driving it the past weekend and it has been perfect. I have a 99 C5 with an automatic trans. If any one can help me that would be great. Thanks to everyone on here, you guys have been a great help, Anthony
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
Here's the symptom diagnosis for what could be ailing your A4.
Slipping or Rough 1-2 Shift
Check: Valve Body Assembly (60)
Causes:
• Mislocated valve body to spacer plate checkball or checkballs.
• 1-2 Shift valve train stuck due to sediment
• Gaskets or spacer plate incorrect, mispositioned or damaged
• 1-2 Accumulator valve stuck or damaged
• Face not flat
• 4-3 sequence valve stuck or damaged
• #1 or #8 checkball missing or mis-located
• 1-2 accumulator valve bushing rotated 180°
Check: 2-4 Servo Assembly (13-28)
Causes:
• Apply pin too long or too short
• 2nd servo apply piston seal missing, cut or damaged
• Restricted or missing oil passages
• Servo bore in case damaged
Check: 2nd Accumulator (55-57, 104)
Causes:
• Porosity in 1-2 accumulator cover or piston
• Piston seal or groove damaged
• Nicks or burrs in 1-2 accumulator housing
• Missing or restricted oil passage
• 1-2 accumulator piston spring not seated
• Rough finish in 1-2 accumulator bore in case
• A cracked 1-2 accumulator piston - allowing fluid to leak by
Check: 2-4 Band (602)
Cause:
• Worn or mispositioned
Oil Pump Assembly (4) or Case (103)
Cause:
• Faces not flat
Slipping or Rough 1-2 Shift
Check: Valve Body Assembly (60)
Causes:
• Mislocated valve body to spacer plate checkball or checkballs.
• 1-2 Shift valve train stuck due to sediment
• Gaskets or spacer plate incorrect, mispositioned or damaged
• 1-2 Accumulator valve stuck or damaged
• Face not flat
• 4-3 sequence valve stuck or damaged
• #1 or #8 checkball missing or mis-located
• 1-2 accumulator valve bushing rotated 180°
Check: 2-4 Servo Assembly (13-28)
Causes:
• Apply pin too long or too short
• 2nd servo apply piston seal missing, cut or damaged
• Restricted or missing oil passages
• Servo bore in case damaged
Check: 2nd Accumulator (55-57, 104)
Causes:
• Porosity in 1-2 accumulator cover or piston
• Piston seal or groove damaged
• Nicks or burrs in 1-2 accumulator housing
• Missing or restricted oil passage
• 1-2 accumulator piston spring not seated
• Rough finish in 1-2 accumulator bore in case
• A cracked 1-2 accumulator piston - allowing fluid to leak by
Check: 2-4 Band (602)
Cause:
• Worn or mispositioned
Oil Pump Assembly (4) or Case (103)
Cause:
• Faces not flat
