OBD-II Code · Transmission
P0735
Gear 5 Incorrect Ratio
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$500–$3,500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
5th gear ratio fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Slipping in 5th
Likely causes
- Worn 5th clutchMost common
- Solenoid
Read the full diagnostic procedureP0735 sets when the TCM commands 5th gear and the calculated ratio is outside the expected 5th-gear window (typical 0.71-0.75:1 on a 5-speed overdriv…
P0735 sets when the TCM commands 5th gear and the calculated ratio is outside the expected 5th-gear window (typical 0.71-0.75:1 on a 5-speed overdrive, varies on 6-8 speeds where 5th may be near direct) by 5-7% for the dwell threshold. On most 5-speed-and-up modern transmissions, 5th gear involves a specific clutch pack or a combination of two apply elements working together, so a P0735 can be caused by any apply element failing or any solenoid commanding the wrong element.
Cheapest-first ladder
- ATF level and condition at spec temperature, line pressure across throttle range under load, scan-tool ratio monitor during a 4-5 upshift on a road test (the ratio should drop cleanly, a flare or slow settling indicates slip), and solenoid resistance checks at the case connector against the trans-specific spec sheet (typical 10-25 ohms for on/off, 4-7 ohms for PWM, infinite ohms is open, under spec is shorted winding).
- Verify the TCM is commanding 5th and not bouncing between 4th and 5th, hunting in the shift command itself can throw P0735 even with a healthy mechanical 5th.
- Expensive misdiagnosis: do not authorize a teardown without first verifying that the trans actually slipped, an erroneous output-speed-sensor reading produces a phantom P0735 with a perfectly healthy mechanical 5th gear, replace the output speed sensor or repair its harness first because that is a $40-150 fix versus a $2,500-4,500 rebuild.
Vehicle-specific patterns2004-2010 Toyota Sienna/Avalon/Highlander with U151E 5-speed sees P0735 from B3 brake apply failure tied to valve-body solenoid wear, sonnax valve-bo…
- 2004-2010Toyota Sienna/Avalon/Highlander with U151E 5-speed sees P0735 from B3 brake apply failure tied to valve-body solenoid wear, sonnax valve-body kits address the root cause;
- 2005-2010Nissan Frontier/Pathfinder 5AT (RE5R05A) has a known 5th-gear apply issue from accumulator and solenoid B wear, Nissan TSB NTB07-077 covers the diagnostic;
- 2007-2013Hyundai Santa Fe/Sonata with A6LF1/A6MF1 6-speed throws P0735 when the 26 clutch pack wears, the trans is often replaced as a remanufactured unit rather than rebuilt because parts availability is limited.
Estimated repair$300 to $4,800.
Look up another code
P0735 — frequently asked
What does a P0735 code mean?
5th gear ratio fault.
What causes a P0735 code?
Common causes: Worn 5th clutch; Solenoid.
What are the symptoms of a P0735 code?
Typical symptoms: Check engine light; Slipping in 5th.
Is it safe to drive with a P0735 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $500-$3,500.
How do I diagnose a P0735 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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