TCM Power Input Signal Low
What it means
P0882 means the transmission control module (TCM) is seeing a low voltage on its power input — it isn't getting enough supply voltage to work reliably. The engine still starts because it has its own controls, but a weak feed to the TCM can cause harsh shifting, slipping, or a protective limp mode where the transmission won't shift. A weak battery, poor connections, or wiring/relay faults are the usual causes, so start with the electrical basics.
Can I keep driving? The engine still starts, but low power to the transmission control module can cause harsh shifting, slipping, or a limp mode where it won't shift; get it diagnosed soon.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh shifting or slipping
- Transmission may not shift at all (limp mode)
- Reduced power or hesitation
Common causes
Most likely first
- Low battery or charging-system voltage (weak battery or alternator)Likely
- Loose or corroded battery, ground, or power connectionsCommon
- Short or high resistance in the TCM power supply wiringCommon
- Blown fuse or faulty power relay feeding the TCMLess often
- Failed transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Test battery and alternator output first — low system voltage is a common trigger.
- Inspect and clean battery terminals and the TCM's power and ground connections.
- Check the TCM supply fuse and relay, and the feed wiring for shorts or high resistance.
- If power delivery is good at the module, suspect the TCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0882?+
Can I just clear P0882?+
Related codes
Read & clear P0882 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.