Diagnostic Instructions
DTC Descriptor
DTC P0719: Brake Switch Circuit Low Input
Circuit/System Description
The TCC brake switch indicates brake pedal status to Transmission Control Module (TCM). The TCC brake switch indicates brake pedal applied or released. The normally-closed switch indicates the battery supplies voltage to Transmission Control Module (TCM).
Apply the brake pedal to active the TCC brake switch, disconnect the PCM the TCM receives 0 volts at the TCC brake switch input, the TCM turns OFF the torque converter clutch pulse width modulation solenoid valve.
DTC P0719 can be set if a disconnected parking brake switch (indicates the pedal is depressed) is detected by the TCM in a series of accelerations. DTC P0719 is a type C DTC.
Conditions for Running the DTC
| • | DTC P0719 failed this ignition cycle. |
| • | Active the ignition voltage. |
| • | DTCs P0722, P0723 are not set. |
Conditions for Setting the DTC
The TCC brake switch indicates a continuous disconnecting for more than 15 minutes, the following conditions occur 8 times continuously.
| • | The vehicle speed is less than 8 km/h (5 mph) |
| • | Then the vehicle speed accelerates to 32 km/h (20 mph) in 4 seconds; |
| • | At last, the vehicle speed keeps at 32 km/h in 6 seconds greater than (20 mph |
Action Taken When the DTC Sets
| • | DTC P0719 is a type C DTC. |
| • | The PCM disregards the TCC brake switch for TCC scheduling when all of the following conditions are met |
| - | The TP angle is greater than 6 percent. |
| - | The vehicle speed is greater than 60 km/h (37 mph). |
| - | The TP angle was previously greater than 12% while the vehicle speed was greater than 68 km/h (42 mph). |
| - | The TCC brake switch has not indicated OFF for more than 2 seconds this trip. |
Conditions for Clearing the DTC
DTC P0719 is a type C DTC.
Diagnostic Aids
| • | Inspect the controller, components and all other circuit attaching points for an intermittent. |
| • | Inspect the circuit wiring for an intermittent. |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Scan Tool Reference
Special Tools
J 35616
GM-Approved Terminal Test Kit Circuit/System Testing
Circuit/System Testing
- Install the scan tool, turn the ignition switch to ON position.
Important: Before clearing the DTCs, use the scan tool to record the Failure Records; use the Clear Info. function to erase the Failure Records from the TCM.
- Record the DTC Failure Records,
- Clearing Diagnostic Trouble Codes,
- Select TCC Brake Switch on the scan tool,
- Disconnect the brake switch connector from the brake switch.
- Connect a test lamp from the ignition 1 voltage supply circuit in the brake switch connector to ground. The test lamp should be illuminated normally.
| ⇒ | If the test lamp is not illuminated, inspect the ignition 1 voltage supply circuit for a short to voltage. |
| ⇒ | If no concerns were found, test the brake switch for a short to ground, if the circuits/connectors test normal, replace the transmission control module (TCM). |
| ⇒ | If no concerns were found, test the ignition 1 voltage circuit of the brake switch for an open, if the circuits/connectors test normal, replace the TCM. |
- Connect a fuse between the ignition 1 voltage supply circuit and the stop lamp switch connector signal circuit. Observe if the Status of the TCC Brake Switch displayed on the scan tool change from OPEN to CLOSED.
| ⇒ | If it changes to CLOSED, replace the brake switch. |
| ⇒ | If there is not change, test the brake switch signal circuit for an open. If the circuit/connection test is normal, replace the TCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
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