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 has detected a problem with the part that helps the car's engine and wheels work together smoothly. It's like when a bicycle chain is loose and doesn't turn the wheels properly.
The P1846 code indicates that the transmission control module has detected a low voltage or resistance problem in the torque converter clutch circuit.
The torque converter clutch (TCC) is a part of the transmission system that locks the engine to the transmission at high speeds to improve fuel efficiency. A 'circuit low' error suggests that the electrical circuit controlling this clutch is not receiving enough voltage, which could be due to a wiring issue, a faulty solenoid, or a problem with the transmission control module.
• Poor fuel economy
• Transmission slipping
• Check Engine Light illuminated
• Faulty torque converter clutch solenoid
• Damaged or corroded wiring or connectors
• Transmission control module malfunction
Torque Converter: A device that transfers rotating power from the engine to the transmission.
Solenoid: An electromechanical device used to control the flow of fluid in the transmission.
• Scan the vehicle for additional codes.
• Inspect the wiring and connectors for damage or corrosion.
• Test the torque converter clutch solenoid for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the torque converter clutch solenoid if faulty.
• Reprogram or replace the transmission control module if necessary.
• OBD-II scanner
• Multimeter
• Wiring repair kit
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain transmission fluid levels.
• Ensure electrical connections are secure and free of corrosion.
• Perform routine transmission service as per vehicle manufacturer's recommendations.
Transmission Issue
• Avoid driving at high speeds until the issue is fixed.
• Consult a professional mechanic for a thorough diagnosis.
Check with your vehicle manufacturer for specific warranty coverage related to transmission components.
The P1846 code has been commonly reported in vehicles with higher mileage or those that have not undergone regular transmission maintenance.
Moderate – While the vehicle may still be drivable, it is important to address this issue to prevent further damage to the transmission.
Driving with a malfunctioning transmission can be unsafe and may lead to further mechanical issues. It is advised to address the problem promptly.
• Vehicle at operating temperature
• Driving at highway speeds
The torque converter clutch solenoid is located inside the transmission, usually accessible by removing the transmission pan.
Q: Can I drive with a P1846 code?
A: While it may be possible to drive, it is not recommended as it can lead to further transmission damage.
Q: How does a torque converter clutch work?
A: It locks the engine to the transmission at higher speeds to improve fuel efficiency and reduce engine load.
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.