I’m looking for guidance in diagnosing a transmission issue on a 2010 Infiniti FX35.
Problem:
On a cold start, the transmission engages normally. However, once the engine/transmission warms up, no gear will engage—Drive, Reverse, or any lower gears. The shifter moves correctly, but the vehicle will not move once warm.
Additional details:
- No current check engine light or active transmission codes
- I’m attaching live diagnostic data from my scan tool for reference
- Transmission fluid has already been changed
- Transmission pan was removed and cleaned, no major debris noted
What I’m trying to determine:
- Where should I begin next with diagnostics?
- Are there specific sensors, solenoids, pressure tests, or TCM-related checks I should focus on?
- Could this be a known issue (valve body, internal seal failure, torque converter, etc.)?
- Or does this behavior typically point to a full transmission replacement?
Any insight on the next diagnostic steps before committing to a transmission swap would be greatly appreciated.
Problem:
On a cold start, the transmission engages normally. However, once the engine/transmission warms up, no gear will engage—Drive, Reverse, or any lower gears. The shifter moves correctly, but the vehicle will not move once warm.
Additional details:
- No current check engine light or active transmission codes
- I’m attaching live diagnostic data from my scan tool for reference
- Transmission fluid has already been changed
- Transmission pan was removed and cleaned, no major debris noted
What I’m trying to determine:
- Where should I begin next with diagnostics?
- Are there specific sensors, solenoids, pressure tests, or TCM-related checks I should focus on?
- Could this be a known issue (valve body, internal seal failure, torque converter, etc.)?
- Or does this behavior typically point to a full transmission replacement?
Any insight on the next diagnostic steps before committing to a transmission swap would be greatly appreciated.
Feb 3, 2026 at 6:55 PM
