Pinpoint Test I: Rotary Shift Knob Performance Concerns

Refer to Transmission Controls for schematic and connector information.

Normal Operation and Fault Conditions

The rotary gearshift knob is part of the GSM and is used to select the desired gear. Under certain conditions the return to park mode is activated and the rotary gearshift knob returns to park by itself. If there is any binding or an obstruction causing the knob not to return to park, the GSM sets a DTC.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
GSM P0919:00	Gear Shift Position Control Error: No Sub Type Information	The GSM detected the rotary gearshift knob motor is unable to return the rotary gear shift knob to park.
GSM P0929:00	Gear Shift Lock Solenoid/Actuator Circuit "A" Range/Performance: No Sub Type Information	The GSM detected the rotary gearshift knob did not lock in park or neutral hold.
GSM P1753:00	Gear Shift Position Sensor Alignment: No Sub Type Information	The GSM detected the rotary gearshift knob is not within calibrated band for at least 60 seconds.

Possible Sources

Debris or interference in the rotary gearshift knob
Discharged battery/charging system
GSM

I1 VERIFY THE BATTERY IS FULLY CHARGED
- NOTE: If necessary, connect a battery charger to the vehicle battery to make sure there is a steady battery voltage while carrying out this test.
  
  Verify the battery is fully charged before proceeding with this test. REFER to: Battery .
Is the battery fully charged?

Yes GO to I2

No CHARGE or INSTALL a new battery if necessary. REFER to: Battery Charging .

I2 CHECK THE GSM (GEAR SHIFT MODULE) AUTO ROTATE FUNCTION
- Ignition OFF.
- Start the engine.
- Repeat the following steps 3 times, waiting 15 seconds between each repeat.
  - Sit in the driver seat with the seat belt unbuckled, the driver door closed, and park selected.
  - Select DRIVE
  - OPEN the driver door.
Does the rotary gearshift knob return to park and lock when the door is opened?

Yes GO to I3

No GO to I4

I3 CHECK FOR GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If a GSM self-test is carried out, the driver door must be fully closed and locked. A false P166B DTC can set if the driver door is not fully closed or if it is unlocked during the self-test.

Using a diagnostic scan tool, carry out the GSM self-test.

Clear the CMDTCs.

Ignition OFF.

Wait 10 seconds.

Start the engine.

Repeat the following steps 3 times, waiting 15 seconds between each repeat.
- Sit in the driver seat with the seat belt unbuckled, the driver door closed, and park selected.
- Select DRIVE
- OPEN the driver door.

Repeat the GSM self-test.

Are any DTCs retrieved?

Yes	If only DTCs P0919, P0929, or P1753 are retrieved, INSTALL and new GSM. REFER to: Gear Shift Module (GSM) . If any other GSM DTCs are retrieved, RESOLVE them first. REFER to DTC Chart - GSM .

No	The concern is not present at this time. It may have been caused by debris or interference around the rotary gearshift knob.

I4 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION

Ignition OFF.

INSPECT the rotary gearshift knob for any debris or interference that would prevent it from rotating. CLEAN as necessary.

Disconnect and inspect GSM C3532 and all related in-line electrical connectors.

Using a good light source, inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary

Reconnect GSM C3532 and all related in-line electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB, GSB (general service bulletin), SSM (special service message) or FSA (Field Service Action). If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) .

No	The system is operating correctly at this time. The concern may have been caused by debris or interference around the rotary gearshift knob, or by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.