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 thinks there's a problem with a switch that helps control how the car shifts gears. It's like a light switch that's stuck in the 'on' position.
The P071F code is triggered when the Transmission Control Module (TCM) detects a high voltage signal from the Transmission Mode Switch B circuit, indicating a potential electrical fault.
The Transmission Mode Switch B is part of the system that manages the transmission's shift modes. A 'high' signal indicates that the voltage level is above the expected range, which could be due to a wiring issue, a faulty switch, or a problem with the TCM itself.
• Transmission not shifting properly
• Check Engine Light illuminated
• Vehicle stuck in a single gear
• Faulty transmission mode switch
• Wiring issues or short circuit in the switch circuit
• Faulty Transmission Control Module (TCM)
Transmission Control Module (TCM): A computer that controls the transmission's operation.
OBD-II: On-Board Diagnostics, a system for self-diagnosing and reporting vehicle issues.
• Scan for codes and verify P071F is present
• Inspect the wiring and connectors for damage
• Test the transmission mode switch for proper operation
• Repair or replace damaged wiring or connectors
• Replace the faulty transmission mode switch
• Reprogram or replace the TCM if necessary
• OBD-II scanner
• Multimeter
• Wiring diagram
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance and inspection of transmission components
• Ensure wiring and connectors are secure and free from corrosion
• Avoid harsh driving conditions that may stress the transmission
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on
• Avoid driving the vehicle if it is not shifting properly
• Regularly check for any signs of transmission issues
Warranty coverage may vary; check with the vehicle manufacturer for specific details.
This code has been associated with issues in vehicles with electronic transmission control systems, particularly in models with high mileage.
Moderate – Addressing this issue promptly can prevent further transmission damage.
Driving with a malfunctioning transmission can be unsafe and may lead to further damage. Consult a professional mechanic.
• Vehicle at operating temperature
• Transmission in gear
The transmission mode switch is typically located on the transmission housing or near the gear selector.
Q: Can I drive my car with a P071F code?
A: It's not recommended to drive for long periods with this code, as it may cause further transmission damage.
Q: How do I reset the P071F code?
A: After repairs, the code can be cleared with an OBD-II scanner. However, ensure the issue is fixed 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.