P099B Possible Causes
- Faulty Shift Solenoid “G”
- Shift Solenoid “G” Harness is Open or Shorted
- Poor Electrical Connection in Shift Solenoid G Circuit
What Does It Mean?
First, diagnose the P099B code
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
P099B Possible Symptoms
- Check Engine Light On (or Service Engine Soon Warning Light)
P099B Description
The Transmission Control Module (TCM) monitors the shift solenoid signal. The TCM sets the OBDII code when the shift solenoid does not meet factory specifications.