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DTC codes / P09xx · Transmission / P097F

P097FShift Solenoid F Control Circuit/Open

P097F indicates that the transmission control module (TCM) has detected an open circuit or excessive resistance in the control circuit for shift solenoid F, which is responsible for controlling a specific gear shift. The computer commands the solenoid to change state but does not see the expected electrical response, so it sets this code and may default to a limp-home mode.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaTransmission

Symptoms you may notice

  • Illumination of the check engine light or transmission warning light
  • Harsh or delayed shifts, especially when the affected gear is engaged
  • Transmission stuck in a single gear or limp-home mode
  • Slipping or flaring during gear changes
  • Often no symptoms besides the warning light, especially if the solenoid is only intermittently faulty

Common causes, most likely first

  1. Open or damaged wiring in the shift solenoid F control circuit
  2. Corroded or loose electrical connector at the solenoid or TCM
  3. Failed shift solenoid F (open coil or mechanical failure)
  4. Faulty transmission control module (TCM) or internal circuit issue
  5. Blown fuse or poor ground connection for the solenoid circuit
  6. Contamination or debris in the valve body causing solenoid malfunction

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm the code and check for related codes
  2. Inspect the solenoid F connector and wiring for damage, corrosion, or loose pins
  3. Measure resistance of the solenoid F coil and compare to manufacturer specification
  4. Check for power and ground at the solenoid connector with the key on and during command
  5. Test the control circuit from the TCM to the solenoid for continuity and shorts
  6. If the circuit is good, replace the shift solenoid F and clear codes
  7. If the circuit or TCM is faulty, repair wiring or replace the TCM as needed

What Most Techs Miss on P097F

  • A loose or corroded connector at the solenoid is a frequent cause that is often overlooked because the solenoid itself tests good.
  • The code can be set by a faulty TCM driver even when the solenoid and wiring are perfect, so always test the control signal at the TCM.
  • Intermittent opens can be caused by chafed wiring harnesses near hot or moving components, which may not show up in a static resistance test.
  • Replacing the solenoid without checking the valve body for debris can lead to repeat failures if contamination is present.
  • Some vehicles use a single solenoid for multiple functions, so a failure may affect more than one gear and mimic other codes.

Can I keep driving with P097F?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration or towing because the transmission may be in limp-home mode and shift erratically. If the transmission slips severely or refuses to engage a gear, stop driving and have it towed to prevent further damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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