Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a part that helps control the pressure of the transmission fluid, and it's not working all the time. It's like a light switch that sometimes doesn't turn on when you flip it.
The pressure control solenoid S is responsible for regulating the hydraulic pressure in the transmission. An intermittent issue means that the solenoid is not consistently performing its function.
The P27D4 code indicates that the transmission control module (TCM) has detected an intermittent fault with the pressure control solenoid S. This solenoid is crucial for maintaining the correct hydraulic pressure within the transmission, which is necessary for smooth gear shifts and overall transmission performance.
• Erratic or harsh shifting
• Transmission slipping
• Illuminated check engine light
• Faulty pressure control solenoid S
• Wiring issues or poor connections in the solenoid circuit
• Transmission fluid contamination or low fluid level
Solenoid: An electromechanical device that controls fluid flow in the transmission.
Transmission Control Module (TCM): A computer that controls the operation of the transmission.
• Check the transmission fluid level and condition
• Inspect the wiring and connectors to the solenoid
• Test the solenoid for proper operation
• Replace the faulty pressure control solenoid
• Repair or replace damaged wiring or connectors
• Flush and refill the transmission fluid
• OBD-II scanner
• Multimeter
• Transmission fluid pressure gauge
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular transmission fluid checks and changes
• Routine inspection of transmission wiring
• Avoiding harsh driving conditions
Transmission Performance Issue
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for an accurate diagnosis.
Check with your vehicle manufacturer for warranty coverage on transmission components.
This code has been associated with vehicles that have experienced intermittent transmission issues, often due to solenoid failures.
High – Driving with this issue can lead to severe transmission damage.
Ignoring transmission issues can lead to unsafe driving conditions and potential legal liabilities.
• Vehicle should be at operating temperature
• Perform tests with the vehicle in park or neutral
The pressure control solenoid S is located inside the transmission, typically accessible by removing the transmission pan.
Q: Can I drive my car with a P27D4 code?
A: It's not recommended to drive with this code active as it can cause further transmission damage.
Q: How can I prevent this issue?
A: Regular maintenance and fluid checks can help prevent solenoid issues.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.