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 inside the car's computer that controls the transmission, like a glitch in a video game that makes it not work right.
The Transmission Control Module (TCM) has detected an internal error related to the high side driver circuit, which is responsible for controlling certain transmission functions.
The P1796 code indicates that the TCM has encountered an error with the high side driver, a component responsible for managing power distribution to various transmission solenoids and actuators. This error can prevent the transmission from operating correctly.
• Check Engine Light is on
• Transmission may not shift properly
• Vehicle may go into limp mode
• Faulty Transmission Control Module (TCM)
• Wiring issues or poor connections
• Internal short circuit within the TCM
Transmission Control Module (TCM): A computer that controls the transmission's operation.
High Side Driver: A circuit responsible for powering transmission components.
• Use an OBD-II scanner to confirm the P1796 code.
• Inspect the TCM and related wiring for damage or poor connections.
• Test the TCM for internal faults using specialized equipment.
• Repair or replace damaged wiring or connectors.
• Replace the Transmission Control Module if faulty.
• Clear the code and test drive the vehicle to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Specialized TCM testing equipment
$300 - $1500
Moderate
• Chrysler Town & Country
• Dodge Caravan
• Jeep Grand Cherokee
• Regularly inspect transmission wiring and connectors.
• Ensure the vehicle's electrical system is properly maintained.
• Avoid harsh driving conditions that may stress the transmission.
Transmission Control Module Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if symptoms occur.
Check if the vehicle's powertrain warranty covers TCM issues.
P1796 is a less common code, typically associated with specific models known for TCM issues.
Moderate – The vehicle may still operate, but transmission issues can worsen over time.
Driving with a faulty transmission control system can lead to unsafe driving conditions.
• Vehicle at operating temperature
• Transmission in Drive mode
The Transmission Control Module is usually located near the transmission or under the dashboard.
Q: Can I drive with a P1796 code?
A: It's not recommended as it can lead to further transmission damage.
Q: How do I reset the TCM?
A: Disconnect the battery for a few minutes, then reconnect it to reset the TCM.
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