Circuit Description
The transmission control module (TCM) requires a switched ignition voltage to operate. The voltage signal should be direct from the ignition switch to avoid any interference.
DTC P0562 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0562 System Voltage Low
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 10 seconds. |
Conditions for Setting the DTC
DTC P0562 sets when the TCM detects ignition voltage below 8.0 volts at 0°C (32°F) for a total of 5 out of 7 seconds. The voltage threshold is temperature dependant, varying from 5.0 volts at -60°C (-76°F) to 9.0 volts at 20°C (68°F).
Action Taken When the DTC Sets
| • | The TCM does not illuminate the malfunction indicator lamp (MIL). |
| • | The transmission fails to hydraulic default. |
| • | DTC P0562 will be 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 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. |
| • | 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. |
| • | Inspect the batteries for proper voltage. |
| • | Inspect the charging system for proper operation. |
| • | You may have to drive the vehicle in order to experience a condition. |
| • | Inspect for the presence of aftermarket accessories, such as remote starters, etc. Depending on how these aftermarket accessories are installed, they may interfere with the required voltage for proper operation of the transmission. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value | Yes | No |
|---|---|---|---|---|
Schematic Reference: Automatic Transmission Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
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 the voltage greater than the specified value? | 10.5 V | Go to Step 4 | Go to Step 3 | |
Test the ignition feed circuit to the TCM for high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 5 | |
4 |
Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 6 |
5 | Repair the ignition feed circuit to the TCM for an open or a short to ground. Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 7 | -- |
6 |
Important: In most cases the TCM is not at fault. Attempt swapping with a known good TCM prior to replacing the TCM. Replace the TCM. Refer to Transmission Control Module Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- |
7 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK | Go to Step 1 |
