The powertrain control module (PCM) continuously monitors that the system voltage stays within the proper range. If the PCM detects an excessively high system voltage, DTC P0563 will set. A high voltage condition may cause a stalling condition or other driveability concerns.
• | The engine run time is more than 20 seconds. |
• | Engine running above 1,200 RPM |
• | Vehicle speed above 8 km/h (5 mph) |
• | The PCM senses the system voltage is above 19 volts. |
• | All of the conditions are present for 5 seconds. |
• | The PCM stores DTC P0563 in the PCM memory when the diagnostic runs and fails. |
• | The PCM will record the operating conditions at the time the diagnostic fails. The PCM stores this information in Failure Records. |
• | The PCM disables most outputs. |
• | The transmission defaults to a predetermined gear. |
• | The torque converter clutch (TCC) operation is inhibited. |
• | The instrument panel cluster (IPC) displays a message. |
• | The malfunction indicator lamp (MIL) will not illuminate. |
• | The Conditions for Setting the DTC are no longer present. |
• | A history DTC will clear after 40 malfunction free ignition cycles. |
• | The powertrain control module (PCM) receives the clear code command from the scan tool. |
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
Schematic Reference: Starting and Charging Schematics Connector End View Reference: Engine Electrical Connector End Views | ||||
1 | Did you perform the Engine Electrical Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Is the battery voltage less than the specified value? | 19 V | Go to Step 4 | Go to Step 3 |
3 | Replace the generator. Refer to Generator Replacement . Is the action complete? | -- | Go to Step 5 | -- |
4 |
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls-4.8L, 5.3L, and 6.0L, Powertrain Control Module Replacement in Engine Controls-4.3L or Powertrain Control Module Replacement in Engine Controls-8.1L. If equipped with a 6.6L (Diesel), refer to Engine Control Module Replacement in Engine Controls-6.6L. Is the action complete? | -- | Go to Step 5 | -- |
5 |
Does the DTC reset? | -- | Go to Step 2 | System OK |