Drivable short-term, but fix now to avoid damage.
This code means shift solenoid D isn't performing as expected or is stuck in the off position, so it can't properly control the fluid that engages a gear. It's often caused by a stuck or failed solenoid, electrical problems, or low or contaminated transmission fluid. Fixes typically include a fluid service, wiring repair, or replacing the solenoid, and it's frequently solvable without a full transmission rebuild.
$150 – $650
Varies by vehicle and root cause.
Short trips are usually possible, but it isn't ideal. If the transmission slips or won't shift, you can be left underpowered in traffic, so have it looked at soon.
Expect roughly $150 to $650. A fluid service or wiring repair is cheaper, while solenoid replacement costs more depending on the vehicle and labor involved.
Yes, it's worth addressing promptly. A solenoid stuck off can keep the transmission from shifting safely and may cause more damage the longer you wait.
It means the solenoid isn't opening to allow fluid flow when it should, so the transmission can't engage the gear it controls. That's what sets off the P0770 code.