Fix P099E: STEP-BY-STEP diagnostic GUIDE!

The P099E: Shift Solenoid ‘H’ Control Circuit Low refers to a low voltage issue in the control circuit of shift solenoid ‘H’. This problem can be caused by a faulty solenoid, low voltage supply, or issues with the wiring and connectors, which may lead to transmission shifting issues or poor performance.

P099E – Quick Overview

Code	Information
Meaning	P099E: Shift Solenoid ‘H’ Control Circuit Low
Is it serious?	Yes, it can cause improper shifting and transmission performance issues.
Possible causes	– Low voltage in the shift solenoid ‘H’ control circuit – Faulty shift solenoid ‘H’ – Wiring or connector issues
How to diagnose?	– Check the circuit for low voltage – Inspect wiring and connectors – Replace the shift solenoid ‘H’ if necessary

P099E Meaning

The P099E code indicates that the shift solenoid ‘H’ is receiving less voltage than expected. This can prevent the solenoid from operating correctly, leading to problems with gear shifting. It may result from wiring issues, a failing solenoid, or insufficient voltage supply.

Step-by-step diagnostic guide

Action	Description	Tools Needed
Check for Other Codes	Use an OBD-II scanner to check for additional transmission-related fault codes.	OBD-II Scanner
Inspect Shift Solenoid ‘H’	Visually inspect the shift solenoid ‘H’ for any physical damage or malfunction.	Flashlight, Safety Gloves
Test the Circuit for Low Voltage	Use a multimeter to measure the voltage in the shift solenoid ‘H’ control circuit.	Multimeter
Inspect Wiring and Connectors	Check the wiring and connectors for any signs of damage, corrosion, or shorts.	Flashlight, Multimeter
Replace Shift Solenoid ‘H’	If the solenoid is faulty, replace it with a new one.	Replacement Parts (Solenoid)
Clear the Code and Test Drive	After repairs, clear the code and test drive the vehicle to verify the fix.	OBD-II Scanner, Vehicle Manual
Recheck for Codes	Re-scan the system to ensure the P099E code has not reappeared.	OBD-II Scanner