OBD-II code · Powertrain (generic)
P0999 Shift Solenoid F Control Circuit High
The control circuit of shift solenoid F reports a control circuit high condition. Gear element actuation cannot be commanded reliably on this channel.
Is it safe to drive with P0999?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyControl wire shorted to B+
- PossibleOpen solenoid coil
- Less likelyConnector pins corroded - high contact resistance
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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Shift Solenoid F, Wiring Harness, Tcm
Related codes
- P08D3Shift Solenoid J Control Circuit High
- P08DCShift Solenoid K Control Circuit High
- P08E5Shift Solenoid L Control Circuit High
- P0974Shift Solenoid A Control Circuit High
- P0977Shift Solenoid B Control Circuit High
- P0980Shift Solenoid C Control Circuit High
- P0983Shift Solenoid D Control Circuit High
- P0986Shift Solenoid E Control Circuit High
- P099CShift Solenoid G Control Circuit High
- P099FShift Solenoid H Control Circuit High
- P0996Transmission Fluid Pressure Sensor/Switch F Circuit Intermittent
- P0997Shift Solenoid F Control Circuit Range/Performance
- P0998Shift Solenoid F Control Circuit Low
- P099AShift Solenoid G Control Circuit Range/Performance
- P099BShift Solenoid G Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.