GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Savana 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 Odometer Inaccurate

Odometer Inaccurate Gas

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster System Check performed?

--

Go to Step 2

Go to Instrument Cluster System Check

2

Inspect the Vehicle Control Module for the correct axle and tire size ratio.

Is the repair complete?

--

Go to Instrument Cluster System Check

Go to Step 3

3
  1. Connect a scan tool in order to monitor vehicle speed.
  2. Record the initial odometer reading.
  3. Perform a drive test over a known distance of at least 8 kilometers (5 miles).
  4. Operate the vehicle at 80 - 110 km/h (50 - 65 mph) if practical.
  5. Inspect the scan tool for the actual speed.
  6. Inspect the speedometer.
  7. Record the final odometer reading.
  8. Record the actual distance driven.

While at speed are the scan tool and the speedometer indications are within 6 km/h (4 mph) of each other?

--

Go to Step 4

Go to Step 5

4

Divide the actual distance driven by the distance driven as indicated by the odometer.

Is the indicated ratio between 0.96 - 1.04?

--

Go to Instrument Cluster System Check

Go to Step 5

5

Replace the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

--

Odometer Inaccurate Diesel

Step

Action

Value(s)

Yes

No

1

Was the Instrument Cluster System Check performed?

--

Go to Step 2

Go to Instrument Cluster System Check

2

Inspect the Vehicle Speed Sensor Buffer for the correct axle and tire size ratio.

Is the repair complete?

--

Go to Instrument Cluster System Check

Go to Step 3

3
  1. Connect a scan tool in order to monitor vehicle speed.
  2. Record the initial odometer reading.
  3. Perform a drive test over a known distance of at least 8 kilometers (5 miles).
  4. Operate the vehicle at 80 - 110 km/h (50 - 65 mph) if practical.
  5. Inspect the scan tool for the actual speed.
  6. Inspect the speedometer.
  7. Record the final odometer reading.
  8. Record the actual distance driven.

While at speed are the scan tool and the speedometer indications are within 6 km/h (4 mph) of each other?

--

Go to Step 4

Go to Step 5

4

Divide the actual distance driven by the distance driven as indicated by the odometer.

Is the indicated ratio between 0.96 - 1.04?

--

Go to Instrument Cluster System Check

Go to Step 5

5

Replace the instrument cluster.

Is the repair complete?

--

Go to Instrument Cluster System Check

--