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 fluid in the transmission, and it's not working well with the computer. It's like when a video game controller doesn't connect properly to the console.
The vehicle's transmission control module (TCM) is receiving data from Pressure Control Solenoid E that it cannot interpret or is incompatible with expected parameters.
The P27AB code indicates that the data being received from Pressure Control Solenoid E is not within the expected range or format that the transmission control module (TCM) can process. This solenoid is responsible for regulating hydraulic pressure in the transmission, and incompatible data can lead to improper transmission operation.
• Harsh or erratic shifting
• Transmission slipping
• Check Engine Light illuminated
• Faulty Pressure Control Solenoid E
• Wiring issues such as shorts or open circuits
• Faulty transmission control module (TCM)
Solenoid: An electromechanical device that controls fluid flow in the transmission.
TCM: Transmission Control Module, a computer that controls transmission functions.
• Use an OBD-II scanner to verify the code.
• Inspect the wiring and connectors for damage.
• Test the Pressure Control Solenoid E for proper operation.
• Replace faulty Pressure Control Solenoid E.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the transmission control module (TCM) if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular transmission fluid changes
• Routine vehicle maintenance
• Inspect wiring harnesses periodically
Transmission Control System Issue
• Avoid driving aggressively until repaired.
• Consult with a certified mechanic for a thorough diagnosis.
Check with your vehicle manufacturer for potential coverage under powertrain warranty.
This code has been associated with solenoid and wiring issues in automatic transmissions, particularly in vehicles with high mileage.
Moderate – Should be addressed soon to prevent further transmission damage.
Ignoring transmission issues can lead to unsafe driving conditions and potential vehicle damage.
• Engine running
• Transmission at operating temperature
Pressure Control Solenoid E is located inside the transmission, typically mounted on the valve body.
Q: Can I drive with a P27AB code?
A: It's not recommended to drive for extended periods as it may cause further transmission damage.
Q: How is a pressure control solenoid tested?
A: A multimeter can be used to check the solenoid's resistance and operation.
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.