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 the part that lets you switch gears manually, like when you're driving a toy car and the gear stick doesn't work right.
The P0956 code indicates an issue with the circuit responsible for the manual mode in an automatic transmission, affecting its performance.
The P0956 code is triggered when the transmission control module (TCM) detects a problem with the auto shift manual mode circuit. This could be due to an electrical fault, such as an open or short circuit, or a mechanical issue within the shift mechanism.
• Check Engine Light is on
• Inability to shift gears manually
• Transmission stuck in one gear
• Faulty shift lever assembly
• Damaged wiring or connectors
• Malfunctioning transmission control module
TCM: Transmission Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the shift lever assembly for damage.
• Check wiring and connectors for signs of wear or damage.
• Replace or repair the shift lever assembly.
• Fix or replace damaged wiring or connectors.
• Reprogram or replace the transmission control module if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$150 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford Fusion
• Regularly check and maintain transmission fluid levels.
• Inspect wiring and connectors periodically.
• Avoid aggressive shifting habits.
Transmission Performance Issue
• Avoid using manual mode until the issue is resolved.
• Consult a professional mechanic for diagnosis and repair.
Check if the vehicle's powertrain warranty covers transmission issues.
This code has been reported in vehicles with higher mileage or those with a history of transmission repairs.
Moderate – It should be addressed soon to prevent further transmission issues.
Driving with a malfunctioning transmission can be unsafe and may lead to further vehicle damage.
• Vehicle in park or neutral
• Engine running
The shift lever assembly is located in the center console of the vehicle.
Q: Can I drive my car with a P0956 code?
A: It's not recommended as it may lead to further transmission issues.
Q: Will a P0956 code affect my car's performance?
A: Yes, it can affect your ability to shift gears manually.
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.