For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2007 🢒 Spark 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - Jatco 🢒 DTC P0720

DTC P0720 for Chevrolet Spark 2007

Circuit Description

The vehicle speed sensor (VSS) provides vehicle speed information to the transmission control module (TCM). This signal is used to control torque converter lock-up and gear change control.

DTC Descriptor

This diagnostic procedure supports the following DTC: DTC P0720 Vehicle Speed Sensor Circuit.

Conditions for Running the DTC

•	Transmission in Drive range

•	Turbine speed is more than 1,000 RPM.

•	Vehicle speed is more than 40 km/h (25 mph).

•	The voltage of the transmission fluid temperature sensor is between 0.1 and 2.4 volts.

•	Throttle position is more than 13 percent.

Conditions for Setting the DTC

Vehicle speed is less than 5 km/h (3 mph) for more than 2 seconds.

Action Taken When the DTC Sets

•	The malfunction indicator lamp (MIL) will illuminate.

•	The TCM will record operating conditions on the first time when the TCM detects a failure.

Conditions for Clearing the MIL/DTC

•	The MIL will turn OFF when the malfunction has not occurred after 3 consecutive driving cycles and the ECM turns off the MIL on the next driving cycle (MIL off at the 4th driving cycle).

•	A history DTC will clear after 40 consecutive warm-up cycles without a fault.

•	Clear the DTCs with a scan tool.

Diagnostic Aids

When DTC P0720 sets, the possible cause of the fault could be:

•	Open or short circuit in the wiring harness and/or connector

•	Vehicle speed sensor malfunction

•	Vehicle speed sensor rotor

•	Faulty TCM

Step	Action	Values	Yes	No
1	Did you perform the Diagnostic System Check - Automatic Transmission?	--	Go to Step 2	Go to Diagnostic System Check - Automatic Transmission
2	Turn the ignition OFF. Disconnect the VSS wiring connector. Turn the ignition ON with the engine OFF Measure the voltage between terminal 1 of the VSS connector and the terminal 2 (ground). Is the voltage reading in the specified range?	12 V	Go to Step 3	Go to Step 5
3	Inspect the VSS for damage. Is the VSS damaged?	--	Go to Step 4	Go to Step 5
4	Replace the vehicle speed sensor. Is the action complete?	--	System OK	--
5	Disconnect the vehicle speed sensor wiring connector and transmission control module (TCM) connector. Check for continuity between the vehicle speed terminal 3 of the transmission wiring connector and terminal 32 of the TCM wiring connector. Is there continuity?		Go to Step 7	Go to Step 6
6	Repair the wiring harness as necessary. Refer to Wiring Repairs . Is the action complete?	--	System OK	--
7	Replace the TCM. Refer to Transmission Control Module Replacement . Is the action complete?	--	Go to Step 8	--
8	After the repair, use a scan tool clear info function and road test the vehicle. Review the DTC info. Observe the DTC Information with a scan tool. Did the last test fail or is the current DTC displayed?	--	Go to Step 2	System OK