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 figuring out what gear the car is in. It's like when you can't tell if a light switch is on or off.
The P27F0 code is triggered when the Transmission Range Control B Position Sensor/Switch Circuit does not perform within its expected range.
The Transmission Range Control B Position Sensor/Switch monitors the position of the gear selector. If the sensor's signal is out of the expected range or does not match the vehicle's operating conditions, the P27F0 code is set.
• Check Engine Light is on
• Transmission may not shift properly
• Vehicle may not start
• Faulty transmission range sensor
• Wiring issues in the sensor circuit
• Faulty transmission control module (TCM)
Transmission Control Module (TCM): A computer that controls the operation of the transmission.
OBD-II: On-Board Diagnostics, a standardized system for vehicle diagnostics.
• Use an OBD-II scanner to confirm the code.
• Check the wiring and connections to the transmission range sensor.
• Test the sensor for proper operation.
• Replace the faulty transmission range sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the transmission control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Honda Accord
• Regularly inspect and maintain transmission components.
• Ensure proper connection and routing of wiring harnesses.
• Avoid harsh driving conditions that may affect transmission performance.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have a professional diagnose the issue to prevent further damage.
• Avoid driving long distances until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on transmission components.
This code has been commonly reported in vehicles with electronic transmission controls, especially as they age.
Moderate – It should be addressed soon to avoid potential transmission damage.
Driving with a faulty transmission sensor can lead to unsafe driving conditions.
• Vehicle at operating temperature
• Transmission in various gear positions
The transmission range sensor is typically located on the side of the transmission housing.
Q: Can I drive with a P27F0 code?
A: It's not recommended to drive for long periods with this code as it can lead to transmission issues.
Q: How can I reset the P27F0 code?
A: You can reset the code using an OBD-II scanner, but it's important to fix the underlying issue first.
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.