GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The transmission does not shift smoothly or without difficulty in reverse gear.

1

Verify that the reverse lockout solenoid circuit is functioning properly.

Is the reverse lockout solenoid circuit functioning properly?

--

Go to Step 3

Go to Step 2

2

  1. Review the reverse lockout solenoid circuit. Refer to DTC P0801 Reverse Inhibit Solenoid Control Circuit in Engine Controls - 5.7 L.
  2. Repair or replace components as necessary.

Does the transmission still shift hard into reverse?

--

--

System OK

3

Review the function of the reverse lockout solenoid. Refer to DTC P0801 Reverse Inhibit Solenoid Control Circuit in Engine Controls - 5.7 L.

Does the reverse lockout solenoid function properly?

--

Go to Step 5

Go to Step 4

4

Replace the reverse lockout solenoid. Refer to Reverse Lockout Solenoid .

Does the transmission still shift hard into reverse?

--

--

System OK

5

Verify that the reverse lockout mechanism is functioning properly.

Is the reverse lockout mechanism functioning properly?

--

Go to Step 8

Go to Step 6

6

  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble and inspect the reverse lockout mechanism for function, wear and damage. Refer to Transmission/Transaxle/Transfer Case Unit Repair Manual.

Is there any wear or damage?

--

Go to Step 7

--

7

  1. Replace worn or damaged components as necessary.
  2. Install the transmission. Refer to Transmission Replacement .

Does the transmission still shift hard into reverse?

--

--

System OK

8

  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble and inspect the transmission for an internal bind, possibly caused by a synchronizer. Refer to Transmission/Transaxle/Transfer Case Unit Repair Manual.

Is there an internal bind?

--

Go to Step 9

--

9

  1. Replace worn or damaged components as necessary.
  2. Install the transmission. Refer to Transmission Replacement .

Does the transmission still shift hard into reverse?

--

--

System OK