DTC C0235 or C035 Rear Wheel Speed Signal Circuit Open. GMC Truck Savana 2000

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2000 🢒 Savana 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C0235 or C035 Rear Wheel Speed Signal Circuit Open

Circuit Description

The EBCM receives the rear wheel speed signal from the VCM/PCM. The signal from the VCM/PCM is always high (12 volts) when the ignition is ON and the vehicle is not moving.

Conditions for Running the DTC

•	The ignition is ON.

•	The vehicle is not moving.

Conditions for Setting the DTC

The voltage on the vehicle speed signal circuit is detected as being low for more than 500 milliseconds.

Action Taken When the DTC Sets

•	The ABS and BRAKE indicators are commanded on.

•	The ABS is disabled for as long as the malfunction is present.

Conditions for Clearing the DTC

•	Repair the condition(s) responsible for setting the DTC.

•	Use the scan tool in order to clear the DTC.

Diagnostic Aids

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Inspect for the following:

•	Backed out terminals

•	Improper mating

•	Broken locks

•

Corrosion

•	Improperly formed or damaged terminals

•	Poor terminal-to-wiring connections

•	Physically damaged wiring

•	Wiring broken inside the insulation

Test Description

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

This step tests if the VCM/PCM is sending a 12 VDC signal to the EBCM.

Step	Action	Value(s)	Yes	No
Schematic Reference: Antilock Brake System Schematics
1	Did you perform the ABS Diagnostic System Check?	--	Go to Step 2	Go to Diagnostic System Check
2	Use a scan tool in order to clear the DTC(s). Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC set?	--	Go to Step 3	Go to Diagnostic Aids
3	Turn the ignition OFF. Disconnect connector C1 from the EBCM. Turn the ignition ON. Use a DMM in order to measure the voltage between the vehicle speed signal circuit (at connector C1) and a good ground. Does the voltage measure greater than the specified value?	10 volts	Go to Step 4	Go to Step 6
4	Inspect for poor connections at the harness connector of the EBCM. 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 5
5	Important: Perform the Tire Size Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement?	--	Go to Step 9	--
6	Test the vehicle speed signal circuit for an open 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 7
7	Inspect for poor connections at the harness connector of the VCM/PCM. 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
8	Important: Perform the setup procedure for the VCM/PCM. Replace the VCM/PCM. Refer to VCM Replacement/Programming in Engine Controls-4.3L, VCM Replacement/Programming in Engine Controls - 5.0 - 5.7, Powertrain Control Module Replacement/Programming in Engine Controls - 6.5, or VCM Replacement/Programming in Engine Controls - 7.4. Did you complete the replacement?	--	Go to Step 9	--
9	Use the scan tool in order to clear the DTC. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC set?	--	Go to Step 3	System OK