Question 1

What does P1811 mean?

Accepted Answer

P1811 - Maximum Adapt and Long Shift (GM). GM-specific: The transmission has reached its maximum adaptive limit for shift timing. The transmission is slipping enough that the computer can no longer compensate.

Question 2

What are the symptoms of P1811?

Accepted Answer

Harsh or delayed shifts, Transmission slipping, 1-2 shift flare, Check engine light

Question 3

What causes P1811?

Accepted Answer

Worn clutch packs, Low/contaminated trans fluid, Shift solenoid wearing, Internal transmission damage, Incorrect fluid type

Question 4

How much does it cost to fix P1811?

Accepted Answer

Typical repair cost: $100-$4,000. On GM, P1811 often means the transmission is on its way out. Try a fluid and filter change first — sometimes fresh fluid can extend the life. But if it's been slipping for a while, internal damage is likely.

P1811 — Maximum Adapt and Long Shift (GM)

Don't guess — diagnose P1811 the right way

Common symptoms of P1811

Common causes of P1811

Repair cost & difficulty

Vehicles commonly affected

Related trouble codes