DTC P0880
Circuit Description
DTCP0880 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 10seconds.
DTCP0880 is a type C DTC.
Conditions for Running the DTC
• / The components are powered and ignition voltage is greater than 9.0volts and less than 18volts.• / Loss of TCM supply voltage before drive cycle data is saved.
Conditions for Setting the DTC
DTCP0880 sets during the next ignition cycle if the TCM loses TCM supply voltage less than 10seconds after the ignition voltage has been turned off.
Action Taken When the DTC Sets
• / The TCM does not illuminate the malfunction indicator lamp(MIL).• / DTCP0880 will be stored in TCM history.
• / Loss of adaptive information for drive cycle. Revert to previous adaptive settings.
• / The TCM inhibits torque converter clutch(TCC) engagement.
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 40warm-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.
Test Description
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 - Automatic Transmission? / -- / Go to Step2 / Go to Diagnostic System Check - Automatic Transmission
2 /
- Install the scan tool.
- Turn ON the ignition, with the engine OFF.
- Record the DTC Freeze Frame and Failure Records.
- Clear the DTC.
- Using a DMM, measure and record the voltage at the battery terminals.
3 / Start the engine and warm to normal operating temperature.
Is the Alternator/Check Engine lamp ON? / -- / Go to Charging System Test in Engine Electrical / Go to Step4
4 /
- Increase the engine speed to 1,000-1,500RPM.
- Observe the system voltage on the scan tool.
5 /
- Turn the ignition OFF.
- Disconnect the TCM connectorC1(GRAY).
- Install the J 39700 breakout box and the J 43799 breakout box adapter. Additional DTCs may set.
- Turn the ignition ON, with the engine OFF.
- Using a DMM, measure the voltage between connectorC1 terminal1 and terminal2, with the ignition ON.
- Measure the voltage between connectorC1 terminal1 and terminal3, with the ignition OFF.
6 /
- Inspect the transmission wiring harness assembly.
- Repair the transmission wiring harness assembly. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
7 / Important:In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.
Replace the TCM. Refer to Transmission Control Module (TCM) Replacement .
Did you complete the replacement? / -- / Go to Step8 / --
8 / Perform the following procedure in order to verify the repair:
- Clear the DTC.
- Using the scan tool, monitor system voltage.
- Select Specific DTC.
- Enter DTCP0880.