OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P0884?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyTCM power relay intermittent
- PossiblePower connector loose
- Less likelyConnector with intermittent contact under vibration
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Tcm, Tcm Relay, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.