Pinpoint Test F: P0814: 00, P0814: 07, P0915, P1753

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Normal Operation and Fault Conditions

The GSM uses 2 PWM sensors to monitor the position of the selector lever. Based on the reading of these 2 sensors, the GSM will illuminate the proper gear indicator LED, and it will communicate the customer selected gear to other modules. The GSM monitors the 2 sensors for the proper frequency, for being within a valid band width, and for matching each other. The GSM monitors each gear indicator LED for circuit integrity, and for proper illumination relative to the selector lever position.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
GSM P0814: 00	Transmission Range Display Circuit: No Sub Type Information	This DTC indicates the GSM detected a malfunction in a gear indicator LED.
GSM P0814: 07	Transmission Range Display Circuit: Mechanical Failures	This DTC indicates the GSM detected a malfunction in the stow button indicator LED.
GSM P0915: 00	Gear Shift Position Circuit "A" Range/Performance: No Sub Type Information	This DTC indicates the GSM detected a fault with the selector lever position sensors.
GSM P1753: 00	Gear Shift Position Sensor Alignment: No Sub Type Information	This DTC indicates the GSM detected that the selector lever was outside of a calibrated band.

Possible Sources

GSM calibration
Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
GSM

F1 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs) from the GSM.
Are any system voltage or internal module diagnostic trouble codes (DTCs) present?

Yes RESOLVE those diagnostic trouble codes (DTCs) first. REFER to the DTC Chart.

No GO to F2

F2 CHECK THE GSM (GEAR SHIFT MODULE) CALIBRATION LEVEL

Verify the GSM calibration is at the latest level.

Is the GSM calibration at the latest level?

Yes

GO to F3

No	PROGRAM the GSM with the latest calibration. REFER to: Module Programming . REFER to: Module Programming . If the DTC returns, GO to F3

F3 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION
- Using a diagnostic scan tool, clear all GSM diagnostic trouble codes (DTCs).
- Ignition OFF.
- Wait 10 seconds.
- Start the engine.
- Repeat the following steps 3 times:
  - Move the selector lever to each gear position, including stow. Pause in each position for at least 60 seconds.
  - Observe the illumination of each gear indicator LED on the GSM while moving the selector lever to each gear position.
  - With Drive selected, press the M button to activate manual mode. Observe the illumination of the M button LED.
Does each indicator LED illuminate correctly as the selector lever is moved to each gear position and the stow and M buttons are pressed?

Yes GO to F4

No GO to F5

F4 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

NOTE: If a GSM self-test is carried out, the driver door must be fully closed. A false P166B DTC may set if the driver door is not fully closed during the self-test.
- Using a diagnostic scan tool, carry out the GSM self-test.
Is DTC P0814: 00, P0814: 07, P0915 and/or P1753 present?

Yes GO to F5

No The fault is not present at this time.

F5 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the GSM connector.

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

Connect the GSM connector. Make sure it seats and latches correctly.

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

Is the concern still present?

Yes	CHECK for an applicable TSB, GSB, SSM, or FSA. If a service bulletin exists for this concern, discontinue this test and follow bulletin instructions. If none address this concern, INSTALL a new GSM. REFER to: Gear Shift Module (GSM) - Vehicles With: Console Shift .

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.