Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B270A 01: Park Lock Solenoid Control Circuit Short to VoltageDTC B270A 02: Park Lock Solenoid Control Circuit Short to Ground
DTC B270A 04: Park Lock Solenoid Control Circuit Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Control | B270A 02 | B270A 04 | B270A 01 | -- |
Ground | -- | 1 | -- | -- |
1. Park lever will not move from PARK with the brake pedal pressed. | ||||
Circuit/System Description
The body control module controls the automatic transmission park lock control solenoid by providing a battery positive voltage to the solenoid. The body control module utilizes a smart driver to control the voltage supply circuit to the automatic transmission park lock control solenoid. The smart driver monitors the voltage and current flow of the control circuit.
Conditions for Running the DTC
| • | The ignition switch is in the ON position. |
| • | The brake pedal is pressed. |
| • | The transmission is in the PARK position. |
| • | The DTC runs continuously once the above conditions are met. |
Conditions for Setting the DTC
B270A 01
The body control module detects a short to voltage in the automatic transmission park lock control solenoid control circuit for 1 second.
B270A 02
The body control module detects a short to ground in the automatic transmission park lock control solenoid control circuit for 1 second.
B270A 04
The body control module detects an open in the automatic transmission park lock control solenoid control circuit for 1 second.
Action Taken When the DTC Sets
The body control module will not attempt to enable the voltage supply circuit of the automatic transmission park lock control solenoid until the next key cycle.
Conditions for Clearing the DTC
| • | A current DTC B270A will clear when the malfunction is no longer present and the ignition switch is cycled. |
| • | A history DTC will clear after 100 ignition cycles with no current DTC active during the 100 ignition cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Automatic Transmission Shift Lock Control Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, observe the scan tool Brake Applied Output Signal parameter while pressing and releasing the brake pedal. The parameter should change from ON to OFF when the brake pedal is depressed.
- While pressing the brake pedal, observe the scan tool Brake Applied Output Signal parameter. The reading should be ON with the brake pedal pressed.
| ⇒ | If the parameter does not change, refer to Stop Lamps Malfunction. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the shift lock actuator.
- Ignition OFF, test for less than 1.0 Ω between the ground circuit terminal and ground.
- Connect a test lamp between the ground circuit terminal and the control circuit terminal.
- Ignition ON, command the scan tool Shift Lock Solenoid Actuator ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, test or replace the shift lock actuator.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the body control module. |
| ⇒ | If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the body control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
