P0880
TCM Power Input Signal
The TCM detects an out-of-range supply voltage at its main power input. Battery voltage is too low or too high during operation.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Low battery or alternator faultCommon
- Poor TCM groundPossible
Parts involved
- TCM
- Battery
- Alternator
- Wiring Harness
P0880 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.