P0880
TCM Power Input Signal
Transmission / TCM power supply
Generic OBD-II
Medium
What it means
P0880 means the transmission control module isn't receiving the steady power input signal it needs to operate. Because the TCM manages all shifting, an interrupted or unstable supply can leave the transmission stuck in gear or in limp mode. The engine still starts and runs — the engine control module has its own supply — so this is a transmission power-feed fault.
Medium
Can I keep driving? The engine starts, but the transmission may lose shift control or drop into limp mode — have it checked promptly.
Common symptoms
What you'll notice
- Check-engine light on
- Transmission stuck in one gear or failing to shift
- Transmission slipping
- Reduced acceleration or limp mode
Common causes
Most likely first
- Damaged or broken wiring in the TCM power input circuitLikely
- Corroded or loose electrical connectorsCommon
- Weak battery or charging-system voltageCommon
- Failed transmission control module (rare)Less often
How to diagnose & fix
Work through it in order
- Test battery and charging-system voltage first — low system voltage can trigger this code.
- Read freeze-frame data and inspect the TCM power feed wiring, grounds, and connectors for damage or corrosion.
- Check the relevant fuses and confirm steady supply voltage reaches the TCM.
- Repair the power and ground circuits; replace the TCM only if it fails to receive correct voltage with wiring confirmed good. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0880?+
The engine runs, but an unstable power feed to the TCM can cause sudden loss of shifting, so limit driving until it's diagnosed.
Can I just clear P0880?+
It will clear, but returns whenever the TCM's power input drops out of range until the wiring or supply fault is fixed.
Related codes
Often seen with P0880
Read & clear P0880 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX