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 is having trouble reading a sensor that tells it what gear the car is in.
The Transmission Range Control B Position Sensor/Switch Circuit is responsible for informing the vehicle's computer about the current gear position. A 'circuit low' condition indicates that the sensor is not sending the expected voltage signal.
The P27F1 code is triggered when the Powertrain Control Module (PCM) detects a low voltage signal from the Transmission Range Control B Position Sensor/Switch Circuit. This sensor is crucial for determining the gear position, and a low signal can indicate wiring issues, a faulty sensor, or problems with the PCM itself.
• Check Engine Light is on
• Transmission may not shift properly
• Vehicle may not start
• Faulty transmission range sensor
• Damaged or corroded wiring or connectors
• Faulty PCM
PCM: Powertrain Control Module, the computer that controls the engine and transmission.
OBD-II: On-Board Diagnostics, a standardized system in cars for self-diagnostics and reporting.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the transmission range sensor for correct operation.
• Replace the transmission range sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain transmission components.
• Keep electrical connections clean and dry.
• Perform regular vehicle diagnostics.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have your vehicle inspected by a professional if you experience shifting problems.
Check with your vehicle manufacturer for specific warranty coverage related to transmission components.
Transmission range sensor issues have been common in vehicles with automatic transmissions, especially as they age.
Moderate – Addressing this issue promptly can prevent further transmission problems.
Driving with a faulty transmission sensor can lead to unsafe driving conditions. It is advisable to have the issue inspected and repaired promptly.
• Vehicle in park or neutral.
• Engine running.
The transmission range sensor is typically located on the side of the transmission housing.
Q: Can I drive my car with a P27F1 code?
A: It's not recommended to drive with this code active as it can lead to shifting problems and unsafe driving conditions.
Q: How do I reset the P27F1 code?
A: After repairs, the code can be cleared using an OBD-II scanner. If the issue is fixed, it should not return.
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.