Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car that tells it which gear to be in, like drive or reverse. It's like if your remote control's buttons stopped working and you couldn't change the channel.
The P27E7 code indicates that there is an issue with the electrical circuit that controls the transmission range, specifically the 'B' circuit. This could mean a break in the wiring or a component failure.
The Transmission Range Control B Circuit/Open code is triggered when the Powertrain Control Module (PCM) detects an open circuit or a malfunction in the 'B' circuit of the transmission range control. This circuit is responsible for sending signals to the transmission to engage the appropriate gear based on driver input and vehicle conditions.
• Transmission not shifting properly
• Check Engine Light illuminated
• Vehicle stuck in limp mode
• Faulty transmission range sensor
• Damaged or corroded wiring/connectors
• Faulty PCM
PCM: Powertrain Control Module, the computer that controls engine and transmission functions.
Transmission Range Sensor: A sensor that detects the position of the gear selector and sends this information to the PCM.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the transmission range sensor for proper operation.
• Repair or replace damaged wiring/connectors.
• Replace the faulty transmission range sensor.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect wiring for damage.
• Keep connectors clean and free of corrosion.
• Ensure proper transmission maintenance.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Avoid driving long distances until the issue is resolved.
Check with your vehicle manufacturer for specific warranty coverage on transmission components.
Transmission range sensor issues have been a common problem in vehicles with electronic automatic transmissions, leading to various diagnostic codes.
Moderate – It is important to address this issue to avoid transmission damage and ensure safe vehicle operation.
Driving with a malfunctioning transmission can lead to unsafe driving conditions and potential legal liabilities.
• Vehicle in park or neutral
• Engine running
The transmission range sensor is typically located on the transmission housing, near the gear selector shaft.
Q: Can I drive with a P27E7 code?
A: It's not recommended to drive with this code, as it may cause transmission issues and unsafe driving conditions.
Q: How can I prevent this code from appearing?
A: Regular maintenance and inspection of the transmission system can help prevent this code.
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.