P1774
Low Coast Brake Solenoid Valve Function
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Jerks when shifting gears
- Increased engine speed when braking
- Check Engine light comes on
- Unstable transmission operation
- Deterioration in acceleration dynamics
Causes
- Brake solenoid malfunction
- Open or short circuit in control circuit
- Low transmission fluid level
- Transmission fluid contamination
- Problems with the transmission control unit
How to Fix
- Check the level and condition of the transmission fluid
- Diagnose the solenoid control circuit
- Check solenoid resistance
- Replace brake solenoid if necessary
- Scan the transmission control module for other errors