OBD Guide
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P1D90

Incorrect Gear Ratio Clutch 2 Defective

P1D90 is an OBD-II diagnostic trouble code meaning: Incorrect Gear Ratio Clutch 2 Defective. Common causes: clutch clutch wear, low transmission fluid level. Estimated repair cost: $167–889.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$167–889 (est.)

Symptoms

  • Jerks when shifting gears
  • Switching delays
  • Transmission overheating
  • Switching to emergency mode
  • Increased speed when switching

Causes

  • Clutch clutch wear
  • Low transmission fluid level
  • Mechatronics malfunction
  • Problems with the hydraulic system
  • Errors in TCM software

How to Fix

  1. Check the level and condition of the transmission fluid
  2. Diagnose mechatronics and hydraulic systems
  3. Check clutch wear
  4. Update TCM software
  5. If necessary, replace the clutch or mechatronics

Related codes

P1D91P1D89P1D92

FAQ

What does the P1D90 code mean?

P1D90 is an OBD-II diagnostic trouble code that indicates: Incorrect Gear Ratio Clutch 2 Defective

What causes a P1D90 error code?

The most common causes of P1D90 include: Clutch clutch wear; Low transmission fluid level; Mechatronics malfunction; Problems with the hydraulic system.

How do I fix a P1D90 diagnostic trouble code?

To fix P1D90: Check the level and condition of the transmission fluid. Diagnose mechatronics and hydraulic systems. Check clutch wear. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1D90?

Limited driving only, diagnose soon

How much does it cost to fix P1D90?

The estimated repair cost for P1D90 is $167–889. Actual cost depends on your vehicle, location, and labor rates.

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