TCM
DTC P0562, P0563, or P2534Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0562
System Voltage Low Voltage
DTC P0563
System Voltage High Voltage
DTC P2534
Ignition On/Start Switch Circuit Low Voltage
Diagnostic Fault Information
Circuit/System Description
The transmission control module (TCM) within the control solenoid valve assembly continuously monitors the system voltage on the ignition voltage circuit. 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 damage. These DTCs detect high or low TCM voltage for an extended period.
Conditions for Running the DTC
P0562
- Ignition voltage was 6.0 volts or greater and has not dropped below 2.0 volts.
- Engine speed is 1,200 RPM or greater.
P0563
Ignition voltage was 6.0 volts or greater and has not dropped below 2.0 volts.
P2534
- Engine is running.
- Normal CAN communication is enabled.
Conditions for Setting the DTC
P0562
The TCM detects system voltage is 11 volts or less for 4 seconds in a period of 12 seconds.
P0563
The TCM detects system voltage is 18 volts or greater for 10 seconds.
P2534
The TCM detects ignition voltage between 2.0 volts and 6.0 volts for 7 seconds or greater with the engine running.
Action Taken When the DTC Sets
P0562 and P0563
DTCs P0562 and P0563 are Type C DTCs.
P2534
- Engine is running.
- Normal CAN communication is enabled.
Conditions for Setting the DTC
Action Taken When the DTC Sets
- DTC P2534 is a Type A DTC.
- The TCM turns the high side driver OFF.
- The TCM commands maximum line pressure.
- The TCM freezes transmission adaptive functions.
- The TCM commands the torque converter clutch (TCC) OFF.
- The TCM limits the transmission to Reverse and fifth gear operation.
- The TCM inhibits Tap Up/Down function.
- The TCM inhibits manual shifting of forward gears.
Conditions for Clearing the DTC
- DTCs P0562 and P0563 are Type C DTCs.
- DTC P2534 is a Type A DTC.
Diagnostic Aids
- Observe the driver information center (DIC) messaging that would indicate the electrical system requires service.
- Running the engine with a battery charger attached may cause DTC P0563 to set.
- Inspect for the following conditions:
- Loose or damaged terminals at the generator
- Loose or worn generator drive belt
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
- Component Connector End Views
- Inline Harness Connector End Views
Description and Operation
Transmission General Description
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-47825-20 Adapter Harness
For equivalent regional tools, refer to Special Tools.
Circuit/System Verification
1. Engine running and accessories OFF. Measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 volts.
2. If the voltage is not within the specified range, or the charge indicator light is ON, refer to Charging System Test.
3. Observe the scan tool TCM Ignition Voltage parameter. The reading should be between 12.6-15.0 volts.
4. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the conditions for running fault codes (DTC). You may also operate the vehicle within the conditions you observe from the freeze frame/failure records. If the vehicle passes the circuit/system verification procedure, then stop. Do not perform the circuit/system test or component test as this may result in unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
1. Ignition OFF, disconnect the X1 20-way harness connector at the transmission.
2. Connect the DT-47825-20 to the vehicle wire harness X1 20-way transmission connector.
3. Test for less than 10 ohms between the ground circuit terminals listed below and ground.
- Terminal 1
- Terminal 18
- If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the ignition and B+ circuit terminals listed below and ground.
- Terminal 10
- Terminal 13
- Terminal 15
5. If the test lamp does not illuminate, test the affected ignition or B+ circuit for a short to ground or an open/high resistance.
6. If all circuits test normal, replace the Q8 control solenoid valve assembly.
Repair Instructions
Note
- Perform the Transmission Adaptive Values Learn following all transmission related repairs. Programming and Relearning
- Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. Control Solenoid Valve and Transmission Control Module Assembly Inspection
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid valve assembly replacement, setup, and programming