Pinpoint Test O : DTC P0814, P0915
WARNING: This page is about a different variant/trim than selected.
- Refer to Shift Interlock
for schematic and connector information.
Normal Operation and Fault Conditions
The GSM sets DTC P0915 when its attempt to boot up is unsuccessful.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition GSM P0814:00 Transmission Range Display Circuit: No Sub Type Information This CMDTC sets if the GSM is not able to detect selector lever position indicator LED illumination. GSM P0915:00 Gear Shift Position Circuit "A" Range/Performance: No Sub Type Information This CMDTC sets if the GSM cannot successfully boot up when the key is turned to the RUN position. Boot failures are typically caused by low system voltage. Possible Sources
- Connectors damaged or pushed-out terminals, circuitry open or high resistance in the voltage feed wiring to the GSM or a loose ground.
- Discharged battery/charging system
- BCM fuse 12 (7.5A)
- GSM
- O1 VERIFY THE BATTERY IS FULLY CHARGED
-
NOTE: If necessary connect the battery charger to the vehicle battery to insure a steady battery voltage while performing this test.
VERIFY battery is fully charged before proceeding with this test. REFER to: Battery .
Is the battery fully charged?
Yes GO to O2 No CHARGE or INSTALL a new battery if necessary. REFER to: Battery . -
- O2 CHECK GSM CALIBRATION LEVEL
- VERIFY the GSM calibration is at the latest level.
Is the GSM calibration at the latest level?
Yes GO to O3 No REFER to: Module Programming . - O3 CHECK THE GSM (GEAR SHIFT MODULE) CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (DTCS)NOTE: If a GSM self-test is performed, the driver door must be closed and locked. A false P166B and/or P081F DTC sets if the driver door is opened or unlocked during the self-test.
- Using a diagnostic scan tool, perform the GSM self-test.
- Clear the CMDTCs.
- Ignition OFF.
- Wait 10 seconds.
- Start the engine.
- Repeat the GSM self-test.
Is DTC P0814 or P0915 retrieved again?
Yes GO to O4 No The issue is not present at this time. It may have been caused by a previous low battery condition. - O4 CHECK POWER CIRCUIT TO GSM FOR AN OPEN
- Ignition OFF.
- Disconnect GSM C3532.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C3532-1 Ground
Is the voltage within 1 volt of the recorded battery voltage?
Yes GO to O5 No CHECK fuse 12 (7.5A), if OK REPAIR the open circuit, if not OK, REFER to the Electrical Wiring Diagram Introduction to diagnose the short circuit. - O5 CHECK GSM GROUND FOR AN OPEN
- Ignition OFF.
-
NOTE: INSPECT the ground eyelet and verify it is clean and tight.
Measure:
Positive Lead Measurement / Action Negative Lead C3532-18 Ground C3532-9 Ground
Is the resistance less than 3 ohms?
Yes GO to O6 No REPAIR the circuit. - O6 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect all GSM connectors.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the GSM connectors. Make sure they seat and latch correctly.
- Operate the system and verify the concern is still present
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs 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 module connections. ADDRESS the root cause of any connector or pin issues.