What are the common causes of P099D?

A shift solenoid H that shifts erratically. A short or open in the shift solenoid H circuit. Low or dirty transmission fluid. A clogged transmission filter. A TCM output fault for solenoid H.

Road test and watch shift solenoid H data. Check the fluid level and condition. Test the shift solenoid H circuit. Measure shift solenoid H resistance. Replace the solenoid if the range is off. Clear the code and retest.

P099D

Shift Solenoid H Control Circuit Range/Performance

System: Transmission (P code)
Lamp: Check Engine Light
Category: Powertrain - Transmission

What it means

P099D means Shift Solenoid H Control Circuit Range/Performance.

Where it lives

For P099D, the part to look at first is the solenoid named here.

Check these first

A shift solenoid H that shifts erratically
A short or open in the shift solenoid H circuit
Low or dirty transmission fluid
A clogged transmission filter
A TCM output fault for solenoid H

What to do next

Road test and watch shift solenoid H data
Check the fluid level and condition
Test the shift solenoid H circuit
Measure shift solenoid H resistance
Replace the solenoid if the range is off
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.