DTC P0563 System Voltage High. Cadillac Seville 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 DTC 🢒 DTC P0563 System Voltage High

Refer to Engine Controls Schematics

PCM Power and Grounds

Engine Controls Components
OBD II Symbol Description Notice
MIL Control and DLC
PCM BATT, EXPORT BRK, IP, ABS Sol, and ABS MOT Fuses
DIM Ignition Inputs
G106, G110, and G109
Ignition Switch
Powertrain Control Module (PCM)
.

The powertrain control module (PCM) checks the system voltage to make sure that the voltage stays within the proper range. Damage to components, and inaccurate input can occur with incorrect system voltage. If the PCM detects an excessively high system voltage, DTC P0563 will set.

Conditions for Running the DTC

Engine speed is more than 1500 RPM.

Conditions for Setting the DTC

The PCM detects a system voltage above 16 volts for less than 1 second.

Action Taken When the DTC Sets

•	The PCM will command a message to be displayed.

•	The PCM will not illuminate the malfunction indicator lamp (MIL).

•	The PCM will store conditions which were present when the DTC set as Fail Records data only.

Conditions for Clearing the DTC

•	The PCM will command the message OFF after one trip in which the diagnostic test has been run and passed.

•	The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

•	The DTC can be cleared by using the scan tool Clear DTC Information function.

Diagnostic Aids

If the condition is intermittent, refer to Intermittent Conditions in Symptoms.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

If ignition voltage and IPC battery voltage are within 0.5 volt of each other, there may be a system voltage condition. If they are not within 0.5 volt of each other, find out why the PCM is different.

Tests if the PCM ignition voltage is actually displaying system voltage.

Step	Action	Value(s)	Yes	No
1	Did you perform the Powertrain On Board Diagnostic (OBD) System Check?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2	Important: If DTCs P0621 or P0622 are also set, diagnose those DTCs first. Refer to DTC P0621 Generator L-Terminal Circuit or DTC P0622 Generator F-Terminal Circuit . Start the engine. With the scan tool, observe the Ignition 1 voltage display. Compare the Ignition 1 display to the battery voltage displayed by the IPC message center. Are PCM and IPC voltage readings different by more than the value specified?	1.0 volts	Go to Step 3	Go to Diagnostic System Check - Engine Electrical in Engine Electrical
3	With the DMM measure voltage to ground on the PCM fuse (installed). Are the Ignition 1 and DMM voltage readings different by more than the value specified?	1.0 volts	Go to Step 4	Go to Diagnostic System Check - Engine Electrical in Engine Electrical
4	Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete?	--	Go to Step 5	--
5	Review and record the scan tool Fail Records data. Clear the DTC(s). Operate the vehicle with the parameter listed in the Conditions for Running the DTC. With the scan tool, observe the Specific DTC Information for DTC P0563 until the test runs. Does the scan tool indicate that DTC P0563 passed?	--	System OK	Go to Step 2