Pinpoint Test B: DTC P0563

Refer to Transmission Controls for schematic and connector information.

Normal Operation and Fault Conditions

The GSM requires an operating voltage between 9 and 16 volts. The GSM receives this voltage from the BCM and has dual ground circuits. Excessive resistance or an open in one or more of these circuits, a discharged battery or a inoperative charging system or overcharging condition results in the GSM setting a DTC. This DTC may also set in the GSM module due to battery charging or vehicle jump starting events.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
GSM P0563:00	System Voltage High: No Sub Type Information	This DTC sets in continuous memory if the voltage supplied to the GSM module is above 16 volts for more than 3 seconds.

Possible Sources

Charging system concern
GSM module

B1 CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS) IN THE PCM (POWERTRAIN CONTROL MODULE)
- Using a diagnostic scan tool, retrieve all continuous memory diagnostic trouble codes (CMDTCs).
Are any charging system diagnostic trouble codes (DTCs) present in the PCM?

Yes DIAGNOSE the vehicle charging concern. REFER to: Charging System .

No GO to B2

B2 CHECK THE BATTERY VOLTAGE
- Using a diagnostic scan tool, clear all GSM diagnostic trouble codes (DTCs).
- Turn off all interior lights, exterior lights and accessories.
- NOTE: Do not allow the engine speed to increase above 2,000 RPM while performing this step or the generator may self-excite and result in default charging system output voltage. If engine speed goes above 2,000 RPM, turn the engine off and restart the engine before performing this step.
  
  Start and run the engine at approximately 1,500 RPM for 3 minutes while monitoring the battery voltage.
Does the battery voltage stay between 13 and 15.2 volts?

Yes GO to B3

No DIAGNOSE the overcharging condition. REFER to: Charging System .

B3 RECHECK THE GSM (GEAR SHIFT MODULE) FOR DTC (DIAGNOSTIC TROUBLE CODE) P0563

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

Ignition OFF.

Ignition ON.

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

Is DTC P0563 still present?

Yes

GO to B4

No	The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.

B4 VERIFY ALL WIRING CONNECTIONS
- Ignition OFF.
- Disconnect and inspect GSM C3245 and 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
Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals?

Yes GO to B5

No REPAIR as necessary.

B5 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION

Connect GSM C3245 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 a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.