GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value

Yes

No

DEFINITION:

The 6-speed transmission does not shift smoothly into reverse gear or will not shift into reverse gear.

1

  1. Turn the ignition switch to the RUN position.
  2. Check for voltage at the reverse lockout solenoid electrical connector.

Is there voltage at the connector?

12 volts

Go to Step 2

Go to Step 5

2

  1. Remove the reverse lockout solenoid assembly from the reverse lockout assembly. Refer to Reverse Lockout Solenoid .
  2. Apply 12 volts to the solenoid electrical connector

Is the solenoid plunger extended?

--

Go to Step 3

Go to Step 6

3

Remove the reverse lockout assembly from the transmission. Refer to Reverse Lockout Solenoid .

Can you easily depress the reverse lockout plunger with your thumb?

--

Go to Step 4

Go to Step 7

4

  1. Remove the transmission. Refer to Transmission Removal or to Transmission Removal .
  2. Disassemble the transmission. Refer to Transmission Disassemble or to Transmission Disassemble .
  3. Look for the following list of causes:
  4. • Worn or broken shift linkage parts
    • A worn or damaged synchronizer sleeve or hub
  5. Replace all worn or damaged parts.

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--

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5

Repair the reverse lockout solenoid circuit. Refer to SECTION 8A.

Is the circuit OK?

--

Go to Step 1

--

6

Replace the solenoid.

Does the transmission shift OK now?

--

System OK

--

7

Repair or replace the reverse lockout assembly. Refer to Reverse Lockout Solenoid .

Does the transmission shift OK now?

--

System OK

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