Speedometer and/or Odometer Inaccurate or Inoperative. Chevrolet Express 2002

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2002 🢒 Express 🢒 Body and Accessories 🢒 Instrument Panel, Gages, and Console 🢒 Speedometer and/or Odometer Inaccurate or Inoperative

Speedometer and/or Odometer Inaccurate or Inoperative Gas

Step	Action	Yes	No
Schematic Reference: Instrument Cluster Schematics
1	Did you perform the Instrument Cluster Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Instrument Cluster
2	Install a scan tool. Raise the vehicle's drive wheels. Refer to Lifting and Jacking the Vehicle in General Information. Start the engine. Place the transmission into drive for automatic transmission or third gear for manual transmission. With the scan tool, observe the Vehicle Speed Sensor parameter in the PCM Engine Data 1 data list. Does the Vehicle Speed parameter match the speedometer display?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Test the vehicle speed signal circuit for an open or for a high resistance between the IPC and the PCM. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 6	Go to Step 4
4	Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 6	Go to Step 5
5	Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the replacement?	Go to Step 6	--
6	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2

Speedometer and/or Odometer Inaccurate or Inoperative Diesel

Test Description

The number below refers to the step number on the diagnostic table.

This step tests for the proper vehicle speed signal from the PCM.

Step	Action	Yes	No
Schematic Reference: Instrument Cluster Schematics
1	Did you perform the Instrument Cluster Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Instrument Cluster
2	Install a scan tool. Raise the vehicle's drive wheels. Refer to Lifting and Jacking the Vehicle in General Information. Start the engine. Place the transmission into drive for automatic transmission and third gear for manual transmission. With the scan tool, observe the Vehicle Speed Sensor parameter in the PCM Engine Data 1 data list. Does the Vehicle Speed parameter match the speedometer display?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Test the vehicle speed signal circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 6	Go to Step 4
4	Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 6	Go to Step 5
5	Replace the IPC. Refer to Instrument Cluster Replacement . Did you complete the replacement?	Go to Step 6	--
6	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2