Circuit Description
The transmission control module (TCM) requires ignition voltage to operate correctly. The voltage signal should be direct from the ignition switch to avoid any interference.
DTC P0563 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0563 System Voltage High
Conditions for Running the DTC
| • | The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts. |
| • | The engine speed is greater than 450 RPM for 1.0 second. |
Conditions for Setting the DTC
DTC P0563 sets when the TCM detects a voltage greater than 18 volts for 6 out of 10 seconds.
Action Taken When the DTC Sets
| • | The TCM does not illuminate the malfunction indicator lamp (MIL). |
| • | The transmission fails to hydraulic default. |
| • | DTC P0563 is stored in TCM history. |
| • | The TCM inhibits torque converter clutch (TCC) engagement. |
| • | The TCM freezes shift adapts. |
Conditions for Clearing the DTC
A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without failure.
Diagnostic Aids
| • | Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions: |
| - | A bent terminal |
| - | A backed-out terminal |
| - | A damaged terminal |
| - | Poor terminal tension |
| - | A chafed wire |
| - | A broken wire inside the insulation |
| • | When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change. |
| • | You may have to drive the vehicle in order to experience a condition. |
| • | Inspect for the presence of aftermarket accessories, such as a remote starter, etc. Depending on how these aftermarket accessories are installed, they may interfere with the required voltage for proper operation of the transmission. |
Step | Action | Value | Yes | No |
|---|---|---|---|---|
Schematic Reference: Automatic Transmission Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Is voltage within the specified value? | B+ | Go to Step 3 | Go to Step 4 |
3 | Start the engine and observe the charge indicator on the instrument cluster. Refer to Charging System Test . Does the charge indicator display voltage higher than specified value? | 18 V | Go to Step 5 | Go to Step 6 |
4 | Replace the battery, or resolve the battery condition. Refer to Battery Inspection/Test . Did you resolve the condition or complete the replacement? | -- | Go to Step 6 | -- |
5 | Repair the charging system. Refer to Charging System Test or Generator Replacement . Did you complete the repair? | -- | Go to Step 6 | -- |
6 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 7 | Go to Step 2 |
7 | With the scan tool, observe the stored information, capture info, and DTC Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |
