P0881 Control module power input: reading or operation not right (gearbox)

By: Diagno editorial team · Updated: 2026-10-15

P0881 means: Control module power input: reading or operation not right (gearbox). The fault is in the control module's own memory, processor, supply or internal circuits. Drive gently and have the car checked soon. The repair usually costs about €50–1200 in Estonia. The most common cause: weak battery or unstable voltage.

What it means

The fault is in the control module's own memory, processor, supply or internal circuits. Often the real cause is a weak battery or a bad ground. There is a signal, but the reading or operation isn't plausible. The cause may be the part itself or a real mechanical fault.

What you may notice

• Engine light on
• The car may go into limp mode
• The engine may not start
• Other modules may also log faults

What could be wrong

1. 1Weak battery or unstable voltage
2. 2Bad ground or supply wire
3. 3Faulty module software
4. 4Internal module failure (moisture or age)

Repair difficulty: Hard

What you can check yourself

Check the battery and terminals before anything else. If the fault appeared after a battery change or jump start, clear it and see whether it returns. Best left to a workshop. It needs a diagnostic tool and experience.

How we fix it

1. We measure battery voltage and module supplies
2. We check the grounds
3. We update or reflash the software
4. We repair or replace the module and code it

Standard SAE description: TCM Power Input Signal Range/Performance