GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Regal 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Speedometer and/or Odometer Inoperative

Step

Action

Value(s)

Yes

No

Important: In order to avoid misdiagnosis, ensure that you zero the J 39200 before taking measurements.

1

Did you perform the instrument cluster diagnostic system check?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

Inspect for any stored instrument cluster Diagnostic Trouble Codes (DTCs).

Are any DTCs stored in memory?

--

Go to Diagnostic Trouble Code (DTC) List/Type

Go to Step 3

3

Did you perform the powertrain control module diagnostic system check?

--

Go to Step 4

Go to Powertrain On Board Diagnostic (OBD) System Check (RPO 3.1L) or Powertrain On Board Diagnostic (OBD) System Check (RPO 3.8L) in Engine Controls

4
  1. Install a scan tool.
  2. Turn the ignition switch to the RUN position.
  3. Select speedometer gauge sweep test under output control main menu.

Does the speedometer gauge perform a full sweep when commanded?

--

Go to Step 6

Go to Step 5

5
  1. Replace the instrument cluster. Refer to Instrument Cluster Replacement .
  2. Inspect the system.

Is the repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

--

6
  1. Ensure that the scan tool is still connected to the DLC connector.
  2. Drive the vehicle.
  3. Compare the scan tool speed display to the instrument cluster speed display.

Do the two speeds agree with each other?

--

Go to Step 7

Go to Step 8

7

Inspect the following components:

    • The speedometer
    • The odometer

Are both components inaccurate?

--

Go to Step 8

Go to Step 10

8

Inspect the vehicle for the following application information:

    • The correct tire size
    • The PCM calibration
    • The vehicle speed sensor

Are these component applications correct?

--

Go to Powertrain On Board Diagnostic (OBD) System Check (RPO 3.1L) or Powertrain On Board Diagnostic (OBD) System Check (RPO 3.8L) in Engine Controls

Go to Step 9

9
  1. Recalibrate the PCM using the correct application for the vehicle.
  2. Inspect the system.

Is repair complete?

--

Go to Diagnostic System Check - Instrument Cluster

Go to Step 10

10

Inspect the cruise control.

Is the cruise control operating properly along with the instrument cluster?

--

Go to Powertrain On Board Diagnostic (OBD) System Check (RPO 3.1L) or Powertrain On Board Diagnostic (OBD) System Check (RPO 3.8L) in Engine Controls

Go to Cruise Control System Diagnostic System Check