Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the electrical circuit that controls one of the parts that helps your car change gears. It's like when a light switch isn't working because the wire is broken.
The P099E code is triggered when the powertrain control module (PCM) detects a low voltage condition in the shift solenoid H control circuit.
Shift solenoids are used in automatic transmissions to control the flow of hydraulic fluid and enable the transmission to shift gears. The P099E code indicates that the voltage in the control circuit for shift solenoid H is lower than expected by the PCM. This could be due to electrical issues such as a short circuit, open circuit, or a faulty solenoid.
• Check Engine Light is on
• Transmission may not shift properly
• Poor fuel economy
• Faulty shift solenoid H
• Wiring issues such as short or open circuits
• Faulty transmission control module (TCM)
Shift Solenoid: A component that controls the flow of transmission fluid to change gears.
PCM: Powertrain Control Module, the vehicle's main computer that controls engine and transmission functions.
• Use an OBD-II scanner to confirm the code
• Inspect wiring and connectors for damage
• Test the shift solenoid H for proper operation
• Repair or replace damaged wiring or connectors
• Replace faulty shift solenoid H
• Reprogram or replace the TCM if necessary
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular transmission fluid changes
• Inspect wiring regularly
• Avoid harsh driving conditions
Transmission Control Issue
• Avoid driving the vehicle until repaired
• Consult a professional mechanic
• Do not attempt DIY repairs unless experienced
Check vehicle warranty for transmission coverage.
This code has been associated with electrical issues in the transmission control system, often requiring wiring repairs or solenoid replacement.
Moderate – Should be addressed soon to prevent further transmission damage.
Driving with a faulty transmission can be dangerous and may lead to further vehicle damage.
• Engine running
• Transmission in gear
The shift solenoid is located within the transmission, accessible by removing the transmission pan.
Q: Can I drive with a P099E code?
A: It's not recommended to drive with this code as it may cause further damage to the transmission.
Q: How is a shift solenoid problem diagnosed?
A: A mechanic will use a scanner to read the code, inspect the wiring, and test the solenoid's electrical resistance.
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