P0735
Gear 5 Incorrect Ratio
Transmission / gear ratio
Generic OBD-II
High
What it means
P0735 means the transmission's actual ratio in 5th gear does not match what the computer expects, based on comparing input and output speeds. It usually points to slipping from low or worn-out fluid, a faulty shift solenoid, or internal wear. The car still drives, but slipping in 5th builds heat and can worsen the damage, so it should be checked promptly.
High
Can I keep driving? Drivable short term, but the transmission may slip in 5th gear, run hot, or enter limp mode — go easy and get it checked to avoid further damage.
Common symptoms
What you'll notice
- Check-engine light on
- Slipping or flaring when shifting into 5th gear
- Harsh or delayed shifts into overdrive
- Transmission running hot or entering limp mode
Common causes
Most likely first
- Low or contaminated transmission fluidLikely
- Failed or stuck shift solenoid for 5th gearCommon
- Valve-body fault causing incorrect line pressureCommon
- Worn clutches, bands, or internal components, or a TCM faultLess often
How to diagnose & fix
Work through it in order
- Check the transmission fluid level and condition first — low or burnt fluid is a common cause.
- Scan for solenoid or pressure codes stored alongside it.
- Inspect the shift solenoid and valve-body circuit for faults.
- If fluid and solenoids are good, internal wear is likely — seek professional diagnosis. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0735?+
Short trips may be fine, but slipping in 5th generates heat and accelerates wear, so drive gently and get it checked.
Can I just clear P0735?+
It will return until the fluid, solenoid, or internal ratio fault is corrected.
Related codes
Often seen with P0735
Read & clear P0735 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX