P0735
Generic (SAE) Basic entry
Gear 5 Incorrect Ratio
Severity
Medium
Typical repair cost
60 – 500 EUR
System
Powertrain
What it means
P0735 is defined as "Gear 5 Incorrect Ratio". the engine control module stores it when the monitored condition for this component or system is outside the limits programmed by the manufacturer.
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Symptoms
- Check engine or transmission warning light
- Harsh, delayed or missing shifts
- Transmission stuck in one gear (limp mode)
- Shuddering or slipping under load
Common causes
- Gear 5 Incorrect Ratio worn, contaminated or out of calibration
- Mechanical problem in the system the sensor measures
- Air, vacuum or exhaust leak influencing the reading
- Wrong or low-quality replacement part
- Wiring resistance causing a small voltage offset
How to diagnose
- Compare the live Gear 5 Incorrect Ratio reading with a known-good value or a second sensor at idle and at 2500 rpm
- Check for air, vacuum or exhaust leaks that could skew the reading
- Inspect the component for contamination and clean it if the design allows
- Verify the part number is correct for the engine
- Replace the Gear 5 Incorrect Ratio if the reading remains out of specification
Frequently asked questions
Can I keep driving with P0735?
Usually yes for a short time, but expect reduced performance or higher fuel use. Have it diagnosed within a few days.
Will clearing P0735 fix it?
No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.