P099D Possible Causes
- Faulty ‘H’ shift solenoid
- H shift solenoid harness is open or shorted
- Poor electrical connection in H shift solenoid circuit
What Does It Mean?
How to Fix Code P099D
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.
P099D Possible Symptoms
Check engine light illuminated (or service engine soon warning light)
P099D Meaning
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.
OBDII Code P099D – ‘H’ Shift Solenoid Control Circuit Range/Performance