What it means
The control module monitors the control circuit for shift solenoid C. It sets this code when it detects an open circuit in that control path.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Shift solenoid C is an electrically operated valve in the transmission hydraulic system that helps select or control particular gear changes. The transmission control module monitors the C solenoid's control path and sets P097C when it detects an open, so the solenoid may not respond to commands.
Common causes
Most likely first.
- Open in solenoid control wire
- Open solenoid coil
- Pin pushed back out of connector body
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Read freeze-frame data and transmission live data for the conditions when P097C set, and note any related solenoid or supply-voltage codes.
- Inspect the transmission connector and the wiring to shift solenoid C for damage, loose connections, corrosion, or a terminal pushed back into the connector.
- With the ignition off and the circuit isolated as specified by the manufacturer, check the C solenoid coil for continuity and compare its resistance with the manufacturer's specification.
- Check continuity of the C control wire between the transmission connector and control module, and check for unintended opens or shorts while moving the harness gently.
- If the solenoid and wiring pass, verify the module connector and its C circuit terminals before considering a control-module fault.
Common fixes
- Repair a loose or damaged connector terminal in the shift solenoid C circuit.
- Repair or replace the open section of the solenoid C control wire.
- Replace shift solenoid C if its coil is open.
- Repair a verified fault in the control module connector or circuit.
Can I keep driving?
Avoid towing, hard acceleration, and unnecessary trips if shifts are delayed, harsh, slipping, or the transmission is stuck in one gear. Continued driving can worsen transmission damage; arrange prompt diagnosis and stop if the vehicle cannot shift safely.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.