What Does P0880 Mean?
The TCM has detected a general fault with its power input signal. The power supply voltage feeding the transmission control module is not within the expected range or is exhibiting abnormal behavior. Without stable power, the TCM cannot reliably control transmission functions including shift solenoids, pressure regulation, and torque converter operation.
Safety Warning
TCM power issues can cause unpredictable transmission behavior including failure to shift, stuck in gear, or sudden limp mode engagement. Minimize driving and have the power circuit inspected immediately.
Common Causes
30%
Corroded or loose power supply connection to TCM
25%
Faulty TCM power relay
20%
Damaged wiring in TCM power feed circuit
15%
Weak or failing vehicle battery causing voltage drops
10%
Failed fuse or fusible link in TCM power circuit
Diagnostic Steps
1
Measure battery voltage at the TCM power input pin with key on — it should be within 11.5V–14.5V (engine running: 13.5V–14.5V).
2
Check the TCM fuse and any fusible links in the power feed circuit — inspect visually and test with a multimeter.
3
Inspect the TCM power and ground connectors for corrosion, loose pins, or heat damage.
4
Load test the battery and verify the charging system output to rule out systemic voltage issues.
5
If a TCM power relay is used, test relay operation by swapping with an identical relay or bench testing with jumper wires.
Estimated Repair Cost
$50 - $800
Parts + labor, varies by vehicle and location
The TCM has detected a general fault with its power input signal. The power supply voltage feeding the transmission control module is not within the expected range or is exhibiting abnormal behavior. Without stable power, the TCM cannot reliably control transmission functions including shift solenoi...
The most common cause of P0880 (TCM Power Input Signal) is: Corroded or loose power supply connection to TCM
Typical repair costs for P0880 range from $50 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
TCM power issues can cause unpredictable transmission behavior including failure to shift, stuck in gear, or sudden limp mode engagement. Minimize driving and have the power circuit inspected immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0880 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control Module Power Supply
Difficulty
Type
Generic (SAE)
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