P0999

Shift Solenoid F Control Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Incorrect gear shifting
Increased engine speed when switching
The gearbox goes into emergency mode
Check Engine light comes on
Car dynamics problems

Causes

Short circuit in solenoid control circuit
Transmission solenoid F malfunction
Wiring harness damage
Transmission control module (TCM) problems
Corrosion of electrical connections

How to Fix

Checking the condition of wiring and connectors
Solenoid F Resistance Testing
Checking the voltage in the control circuit
Replacing a faulty solenoid if necessary
Reset the error and retest the system

Related codes

P0997 P0998 P0973