Conditions for Clearing the DTC

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The history DTC clears after 100 malfunction free warm-up cycles.
The DTC becomes history when the conditions for setting the DTC are no longer present.
The IPC receives the clear code command from the scan tool.

DTC B0540

Step	Action	Yes	No
Schematic Reference: Instrument Cluster Schematics
1	Did you perform the IPC 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 an automatic transmission and third gear for a manual transmission. With the scan tool, observe the Vehicle Speed 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	Turn the ignition OFF. Disconnect the PCM connector C1. Install the J 33431-C Signal Generator and Instrument Panel Tester lead to the vehicle speed signal circuit at the PCM harness connector, and the other lead to a good ground. See Special Tools and Equipment . Turn the ignition ON, with the engine OFF. Set the J 33431-C to generate a speedometer signal. See Special Tools and Equipment . Does the vehicle speedometer indicate a reading?	Go to Step 5	Go to Step 4
4	Test the vehicle speed signal circuit for an open, short to voltage or a short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 9	Go to Step 6
5	Inspect for poor connections at the PCM connector. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 9	Go to Step 7
6	Inspect for a poor connection at the harness connector of the IPC. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS and CONNECTOR REPAIRS in Wiring Systems. Did you find and correct the condition?	Go to Step 9	Go to Step 8
7	IMPORTANT: Program the replacement PCM. Replace the PCM. Refer to POWERTRAIN CONTROL MODULE . Did you complete the replacement?	Go to Step 9	-
8	IMPORTANT: Program the replacement IPC Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement . Did you complete the replacement?	Go to Step 9	-
9	Use the scan tool in order to clear the DTC's. Operate vehicle within the conditions for running this DTC as specified in the supporting text. Does the DTC reset?	Go to Step 2	System OK