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.
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
Often seen with P0882
Read & clear P0882 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.