OBD-II code · Powertrain (generic)
P0778 Pressure Control Solenoid B Electrical
General electrical fault on the pressure control solenoid B circuit — open coil, short to ground or battery, or driver feedback outside the expected range.
Is it safe to drive with P0778?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen solenoid coil
- PossibleDamaged wiring at the transmission case connector
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Pressure Control Solenoid B, Tcm, Wiring Harness
Related codes
- P0748Pressure Control Solenoid A Electrical
- P0777Pressure Control Solenoid B Stuck On
- P0798Pressure Control Solenoid C Electrical
- P08BDPressure Control Solenoid L Electrical
- P08C6Pressure Control Solenoid M Electrical
- P2716Pressure Control Solenoid D Electrical
- P2725Pressure Control Solenoid E Electrical
- P2734Pressure Control Solenoid F Electrical
- P27BBPressure Control Solenoid N Electrical
- P27C3Pressure Control Solenoid P Electrical
- P27CBPressure Control Solenoid R Electrical
- P27D3Pressure Control Solenoid S Electrical
- P0775Pressure Control Solenoid B
- P0776Pressure Control Solenoid B Performance
- P0779Pressure Control Solenoid B Intermittent
- P077AOutput Shaft Speed Sensor Circuit - Loss of Direction Signal
- P077BOutput Shaft Speed Sensor Circuit - Direction Error
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.