P0884
TCM Power Input Signal Intermittent
The TCM detects intermittent loss of main supply voltage above a threshold count. Often caused by loose connector or relay fault.
- 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.
- TCM power relay intermittentCommon
- Power connector loosePossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- TCM
- TCM Relay
- Wiring Harness
P0884 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.