DTC P0880 will set if an abnormal power-down sequence has occurred. This condition means the transmission control module (TCM) has lost battery positive voltage circuit, supply voltage, before it has finished saving information from that drive cycle. This process is usually completed in less than 10 seconds.
DTC P0880 is a type C DTC.
This diagnostic procedure supports the following DTC:
DTC P0880 Transmission Control Module (TCM) Power Input Signal
• | The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts. |
• | Loss of TCM supply voltage before drive cycle data is saved. |
DTC P0880 sets during the next ignition cycle if the TCM loses TCM supply voltage less than 10 seconds after the ignition voltage has been turned off.
• | The TCM does not illuminate the malfunction indicator lamp (MIL). |
• | DTC P0880 is stored in TCM history. |
• | Loss of adaptive information for drive cycle. Revert to previous adaptive settings. |
• | The TCM inhibits torque converter clutch (TCC) engagement. |
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.
• | 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. |
The numbers below refer to the step numbers on the diagnostic table.
This step tests the system voltage.
This step tests the vehicle charging system.
This step tests the wiring harness for opens or shorts.
Step | Action | Value | Yes | No |
---|---|---|---|---|
Schematic Reference: Automatic Transmission Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 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. Important: If other DTCs are present, refer to the applicable diagnostic tables before continuing. Is voltage within the specified value? | B+ | Go to Step 3 | Go to Battery Inspection/Test | |
3 | Start the engine and warm to normal operating temperature. Is the Alternator/Check Engine lamp ON? | -- | Go to Charging System Test | Go to Step 4 |
Is voltage within the specified range? | 13-15 V | Go to Step 5 | Go to Charging System Test | |
Is the voltage greater than the specified value? | 0.5 V | Go to Step 6 | Go to Step 8 | |
6 |
Was a loss of voltage detected? | -- | Go to Step 7 | Go to Step 8 |
7 |
Did you complete the repair? | -- | Go to Step 9 | -- |
8 |
Important: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM. Swap the TCM with a known good TCM to confirm diagnosis. Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 9 | -- |
9 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 10 | Go to Step 2 |
10 | 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 |