P0880
TCM Power Input Signal
- Severity
- High
- Driving
- Drive only to a garage
A fault in the power supply signal to the transmission control module. The module is monitoring its own supply voltage and does not like what it sees. Transmission modules need a stable supply to drive solenoids accurately, so a supply problem shows up as poor shift quality long before the module actually stops working.
Possible causes
- CommonWeak or failing battery
- CommonCorroded earth strap or module earth point
- CommonCorroded or loose battery terminals
- CommonCharging system fault - failing alternator
- PossibleBlown fuse or failing relay in the module supply
- PossibleDamaged supply wiring
What you might notice
- Harsh or erratic shifting
- Transmission dropping into limp mode
- Other electrical warning lights at once
- Slow cranking
- Check engine light on
What to check, in order
- Check battery voltage, state of charge and the terminals first. This is the same false lead that dominates communication codes, and it is genuinely the cause more often than any module fault.
- Check the charging system output with the engine running.
- Clean and check the module earth points. Corroded earths cause voltage problems that look exactly like a failed module.
- Check the supply fuses and relays.
- Do not order a control module on the strength of a power supply code. The module is reporting a problem, not necessarily having one.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Transmission
P0800P0801P0802P0803P0804P0805P0806P0807P0808P0809P0810P0811P0812P0813P0814P0815P0816P0817P0818P0819P0820P0821P0822P0823P0824P0825P0826P0827P0828P0829P0830P0831P0832P0833P0834P0835P0836P0837P0838P0839P0840P0841P0842P0843P0844P0845P0846P0847P0848P0849P0850P0851P0852P0853P0854P0855P0856P0857P0858P0859P0860P0861P0862P0863P0864P0865P0866P0867P0868P0869P0870P0871P0872P0873P0874P0875P0876P0877P0878P0879P0880P0881P0882P0883P0884P0885P0886P0887P0888P0889P0890P0891P0892P0893P0894P0895P0896P0897P0898P0899