Error code

OBD2 P0735

OBD2P0735
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Gear 5 Incorrect Ratio.

Severity

moderateThe vehicle can still be driven, but performance issues and potential damage to the transmission may occur if not addressed.

Summary

P0735 indicates that the gear ratio for fifth gear in your transmission is incorrect. This issue can affect how smoothly and efficiently your vehicle shifts gears.

Symptoms

  • Lack of power
  • Slow speeds
  • Transmission slipping
  • Erratic shifting
  • Harsh shifts

Common Causes

  • Low transmission fluid level
  • Dirty or contaminated transmission fluid
  • Transmission oil leak
  • Clutch problems within the transmission
  • Low oil pressure
  • Faulty transmission control module (TCM)
  • Damaged speed sensor(s) on the transmission
  • Corroded connections or pins in the wiring harness

Diagnosis

  1. Check for other related transmission codes.
  2. Inspect and top up transmission fluid level.
  3. Visually inspect the transmission housing for cracks or leaks.
  4. Test oil pressure in each gear.
  5. Check resistance values of speed sensors.
  6. Inspect wiring circuits for continuity, shorts, and opens.

Fixes

  • Replace faulty parts such as transmission fluid, seals, or sensors based on diagnosis.

FAQ

What should I do if the P0735 code persists after basic troubleshooting?

If the issue remains unresolved, it may indicate an internal transmission problem. It's recommended to take your vehicle to a professional mechanic for further diagnosis and repair.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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