P0562-BATTERY/SYSTEM VOLTAGE LOW
For a complete wiring diagram, refer to the Wiring Information.
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Theory of Operation
The Transmission Control Module (TCM) monitors ignition voltage. The DTC will set if the monitored battery voltage drops below 8.5 volts and a temporary limp in will be activated. If the voltage rises above 9.0 volts, normal operations is resumed and the TCM will record the DTC as a one trip fault. The DTC will only mature to a full DTC if the voltage is less than 8.5 volts with an engine speed greater than 2000 RPM for a least 60 seconds.
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When Monitored:
Continuously with the ignition on.
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Set Condition:
When battery voltage drops below 8.5 volts.
Possible Causes |
|---|
| ENGINE CHARGING SYSTEM DTCS |
| LOW BATTERY VOLTAGE |
| TRANSMISSION CONTROL RELAY B (+) SUPPLY CIRCUIT HIGH RESISTANCE |
| (Z916) GROUND CIRCUIT HIGH RESISTANCE |
| (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT HIGH RESISTANCE |
| TRANSMISSION RELAY |
| TRANSMISSION CONTROL MODULE (TCM) |
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
1. CHECK FOR PCM CHARGING SYSTEM DTCS
| 1. | With the scan tool, read PCM DTCs. |
Are there any PCM Charging System DTCs present?
Yes
- (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Diagnosis and Testing) and perform the appropriate diagnostic procedure.
No
- Go To 2
| 1. | Start the engine. |
| 2. | With the scan tool, under transmission, check system voltage. |
Is the transmission system voltage above 9.0 volts?
Yes
- Go To 7
No
- Go To 3
3. CHECK THE TRANSMISSION CONTROL RELAY B (+) SUPPLY CIRCUIT
| 1. | Turn the ignition off to the lock position. |
| NOTE: | Due to different power control configurations, the Transmission Control Relay may be referred to as a PCM relay. |
| 2. | Remove the Transmission Control Relay. |
| 3. | Ignition on, engine not running. |
| 4. | Using a 12-volt test light connected to ground, check the Transmission Control Relay B(+) Supply circuit in the Transmission Relay connector. |
| NOTE: | The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. |
Does the test light illuminate brightly?
Yes
- Go To 4
No
- Repair the Transmission Control Relay B(+) Supply circuit for high resistance.
-
Perform the TRANSMISSION
VERIFICATION TEST. (Refer to
28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM)
- Standard
Procedure).
4. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT
| 1. | Turn the ignition off to the lock position. |
| 2. | Remove the Transmission Relay. |
| 3. | Connect a jumper wire between the Transmission Control Relay B(+) Supply circuit and the Transmission Control Output circuit in the Transmission Relay connector. |
| 4. | Start the engine. |
| 5. | With the scan tool, under transmission, check system voltage. |
Is the transmission system voltage above 9.0 volts?
Yes
- Replace the Transmission Relay.
- Perform the TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
-
Go To 5
5. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT
| 1. | Turn the ignition off to the lock position. |
| 2. | Disconnect the TCM C1 harness connector. |
| 3. | Ignition on, engine not running. |
| 4. | Using a 12-volt test light connected to ground, check the (T16) Transmission Control Output circuit in the TCM C1 harness connector. |
| NOTE: | The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. |
Does the test light illuminate brightly?
Yes
- Go To 6
No
- Repair the (T16) Transmission Control Output circuit for high resistance. Make sure the check the fuse cavities.
-
Perform the TRANSMISSION
VERIFICATION TEST. (Refer to
28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM)
- Standard
Procedure).
6. CHECK (Z916) GROUND CIRCUIT
| 1. | Turn the ignition off to the lock position. |
| 2. | Using a 12-volt test light connected to 12-volts, check the (Z916) Ground circuit in the TCM C1 harness connector. |
Does the test light illuminate brightly?
Yes
- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM in accordance with the Service Information.
- Perform the TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No
7. CHECK THE WIRING AND CONNECTORS
| 1. | The conditions necessary to set this DTC are not present at this time. |
| 2. | Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. |
| 3. | Wiggle the wires while checking for shorted and open circuits. |
Where there any problems found?
Yes
- Repair as necessary.
- Perform the TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure).
No