P0735 — Gear 4 Incorrect Ratio
Drivable short-term, but fix now to avoid damage.
What P0735 means
This code means the transmission's actual ratio in fourth gear doesn't match the expected value, a typical indicator of slipping. It's often caused by low or worn fluid, worn clutch packs or bands, or a failing solenoid. Addressing it early can sometimes keep the repair to a fluid service or solenoid rather than a major rebuild.
Common symptoms
- Check engine light is on
- Transmission slips in fourth gear
- Engine revs high at highway speeds
- Harsh or delayed shifts
- Reduced fuel economy
Common causes
- Low or worn transmission fluid
- Worn clutch packs or bands
- Faulty shift solenoid
- Valve body problems
- Internal transmission wear
Typical repair cost
$200 – $2500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0735 code?
You can drive short distances, but slipping in fourth gear builds heat and can worsen the damage, especially at highway speeds, so get it checked soon.
How much does it cost to fix a P0735 code?
A fluid service or solenoid replacement may cost $200 to $600, but internal clutch or band repairs can run $1,500 to $2,500 or more depending on the vehicle.
Is a P0735 code serious?
Yes. It points to slipping in fourth gear, which is your main highway gear, and ignoring it can lead to expensive transmission damage.
Why does P0735 hurt my fuel economy?
When fourth gear slips, the engine spins faster than it should for your speed, burning more fuel and reducing efficiency until the issue is fixed.