Diagnostic Instructions
DTC Descriptor
DTC P0562: System Voltage Low
DTC P0563: System Voltage High
Circuit/System Description
The transmission control module (TCM) continuously monitors the system voltage on the Ignition voltage circuits. The TCM is located within the control solenoid (w/body and TCM) valve assembly and is not serviced separately. Lower than normal voltage
may be inadequate to operate the transmission control solenoids properly. Improper solenoid operation may cause erratic transmission operation, which may result in internal transmission damage.
Conditions for Running the DTC
P0562
The engine is running.
P0563
Ignition voltage has been greater than 12 volts for 1 second this ignition cycle.
Conditions for Setting the DTC
P0562
The TCM detects system voltage is 10 volts or less for 5 out of 6 seconds.
P0563
The TCM detects system voltage is 18 volts or greater for 5 out of 6 seconds.
Action Taken When the DTC Sets
DTCs P0562 and P0563 are Type C DTCs.
Conditions for Clearing the DTC
DTCs P0562 and P0563 are Type C DTCs.
Diagnostic Aids
| • | Observe the driver information center (DIC) messaging that would indicate the electrical system requires service. |
| • | Inspect for the following conditions: |
| - | Loose or damaged battery terminals |
| - | Loose or corroded connections at the transmission |
| - | Loose or corroded connections at the accessory power module (APM) |
Reference Information
Schematic Reference
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
Engine ON, measure and record the battery voltage with a DMM. The battery voltage should be between 12.5-14.5 volts.
| ⇒ | If the voltage is not within the specified value, or the Charge Indicator light is ON, go to
Charging System Test. |
Circuit/System Testing
- Ignition OFF, disconnect the X175 transmission 16-way harness connector at the transmission.
- Ignition ON, verify that a test lamp illuminates between the ignition voltage circuits listed below and ground.
| ⇒ | If the test lamp does not illuminate, test the ignition circuit for a Short to Ground or an Open/High Resistance. |
- If all circuits test normal, replace the control solenoid (w/body and TCM) valve assembly.
| ⇒ | If the voltage is not within the specified value, test the Ignition Voltage circuit for an Open/High Resistance or Short to Ground. |
| ⇒ | If the voltage is within the specified range, replace the control solenoid (w/body and TCM) valve assembly. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
