DTC P0562 System Voltage Low. Pontiac Firebird 2000

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2000 🢒 Firebird 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E 🢒 DTC P0562 System Voltage Low

Refer to Engine Controls Schematics,

Power, Ground and MIL

Engine Controls Components
Powertrain Control Module Description
Data Link Connector (DLC)
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Fusible Links, IP Fuse Block, and Underhood Electrical Centers
Ignition Switch and Underhood Electrical Center 2
Powertrain Control Module Connector End Views
for complete circuit details.

The PCM continuously monitors the system voltage. The system voltage information is taken from the PCM's ignition feed circuits. Voltages below 8.0 volts or above 18.0 volts causes improper system operation and/or component damage. The PCM operates in a default mode if a PCM voltage DTC sets. The PCM disables most outputs to protect the hardware if the system voltage is high. A scan tool may not display data if system voltage is below 8.0 volts. Use a DMM to monitor the system voltage in order to verify if the fault is currently present. A low voltage may cause a stalling condition, or other driveability concerns.

Conditions for Running the DTC

•	The engine run time is longer than 10 seconds.

•	The engine speed is more than 1,000 RPM.

•	The vehicle speed is more than 8 km/h (5 mph).

Conditions for Setting the DTC

•	The PCM senses system voltage below 8.0 volts.

•	All the above conditions are present for 5 seconds.

Action Taken When the DTC Sets

•	The PCM stores DTC P0562 in memory when the diagnostic runs and fails.

•	The Malfunction Indicator Lamp (MIL) will not illuminate.

•	The PCM will record the operating conditions at the time the diagnostic fails. The PCM stores this information in Failure Records.

•	The PCM will command a high idle speed.

•	The transmission defaults to third gear.

•	The TCC operation is inhibited.

Conditions for Clearing the DTC

•	A last test failed, or current DTC, clears when the diagnostic runs and does not fail.

•	A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.

•	Use a scan tool in order to clear the DTC.

Diagnostic Aids

Important:

•	Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM.

•	For any test that requires probing the PCM or a component harness connector, use the J 35616 connector test adapter kit. Using this kit prevents damage to the harness/component terminals. Refer to Using Connector Test Adapters in Wiring Systems.

An extremely low voltage (below 7.5 volts) may cause the loss of serial data and the MIL may not function. An open ignition feed circuit causes a no start and the MIL will not illuminate. A low system voltage may cause other DTCs to set.

For an intermittent condition, refer to Symptoms .

Test Description

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

Ensure the battery is at a full state of charge before proceeding with this diagnostic. Monitoring the Ignition 1 voltage with the scan tool will help isolate the condition. If B+ is displayed on the scan tool, then the wiring and PCM are OK.

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 DTC P1637 is also set, refer to DTC P1637 Generator L-Terminal Circuit for further diagnosis. Ensure the Battery is fully charged before proceeding with this diagnostic. Monitor the Ignition 1 Voltage using the scan tool. Does the scan tool display the specified value?	B+	Go to Diagnostic Starting Point - Engine Electrical in Engine Electrical	Go to Step 3
3	Inspect the PCM IGN fuse Is the fuse open?	--	Go to Step 6	Go to Step 4
4	Turn OFF the ignition. Disconnect the PCM connector C1 located on the same side as the manufacturer's logo. Refer to Powertrain Control Module Replacement/Programming . Turn ON the ignition leaving the engine OFF. Measure the voltage at terminal (C1-19) for the ignition feed circuit using the DMM. Refer to Measuring Voltage in Wiring Systems. Is the voltage at the specified value?	B+	Go to Step 7	Go to Step 5
5	Test the continuity of the Ignition feed circuit using the DMM. Refer to Testing for Continuity in Wiring Systems. Does the DMM display continuity below the specified value?	5ohms	Go to Step 7	Go to Step 6
6	Repair the ignition feed circuit to the PCM for an open or a short to ground. Refer to Wiring Repairs in Wiring Systems. Replace the PCM IGN fuse if necessary. Is the action complete?	--	Go to Step 9	--
7	Inspect for poor connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. If you find a poor connection repair the condition as necessary. Refer to Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition?	--	Go to Step 9	Go to Step 8
8	Important:: Program the replacement PCM. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Is the action complete?	--	Go to Step 9	--
9	Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan tool. Idle the engine at the normal operating temperature. Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable. Does the scan tool indicate that this test ran and passed?	--	Go to Step 10	Go to Step 2
10	Select the Capture Info option and the Review Info option using the scan tool. Does the scan tool display any DTCs that you have not diagnosed?	--	Go to the applicable DTC table	System OK