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 reading the speed of a part inside the transmission. It's like when your watch keeps stopping and starting, so you can't tell what time it is.
The P0794 code is triggered when the transmission control module (TCM) detects an intermittent signal from the intermediate shaft speed sensor A.
The intermediate shaft speed sensor A is responsible for providing the TCM with the rotational speed of the intermediate shaft. An intermittent circuit issue means the sensor is not sending a consistent signal, which can affect transmission performance.
• Erratic or harsh shifting
• Transmission slipping
• Check Engine Light illuminated
• Faulty intermediate shaft speed sensor
• Wiring issues such as frayed wires or poor connections
• Faulty transmission control module
TCM: Transmission Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the intermediate shaft speed sensor with a multimeter.
• Replace the intermediate shaft speed sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the transmission control module if necessary.
• OBD-II Scanner
• Multimeter
• Socket set
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain transmission wiring.
• Ensure connectors are clean and secure.
• Follow scheduled maintenance for the transmission system.
Sensor Issue
• Avoid driving aggressively until the issue is fixed.
• Get the vehicle inspected by a professional mechanic.
• Monitor for any changes in transmission behavior.
Check with your vehicle manufacturer for specific warranty coverage on transmission components.
The P0794 code has been documented in various models, often related to sensor failures or wiring issues.
Moderate – It is advisable to address this issue soon to prevent further transmission damage.
Driving with a faulty transmission sensor can lead to unsafe driving conditions. Address the issue promptly.
• Vehicle at operating temperature
• Transmission in drive mode
The intermediate shaft speed sensor is typically located on the transmission housing.
Q: Can I drive with a P0794 code?
A: It's not recommended to drive for long periods with this code, as it can lead to further transmission issues.
Q: How do I reset the P0794 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
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.