OBD Guide
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P1D30

Oil Viscosity Too Low

P1D30 is an OBD-II diagnostic trouble code meaning: Oil Viscosity Too Low. Common causes: using oil of the wrong viscosity, severe oil dilution by fuel. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Check Engine light comes on
  • Increased engine noise
  • Reduced oil pressure
  • Increased oil consumption
  • Reduced engine power

Causes

  • Using oil of the wrong viscosity
  • Severe oil dilution by fuel
  • Engine overheating
  • Oil temperature sensor malfunction
  • Oil contamination

How to Fix

  1. Check the oil level and condition
  2. Change oil and oil filter
  3. Check the operation of the cooling system
  4. Diagnose the oil temperature sensor
  5. Use oil of recommended viscosity

Related codes

P0520P0521P0522

FAQ

What does the P1D30 code mean?

P1D30 is an OBD-II diagnostic trouble code that indicates: Oil Viscosity Too Low

What causes a P1D30 error code?

The most common causes of P1D30 include: Using oil of the wrong viscosity; Severe oil dilution by fuel; Engine overheating; Oil temperature sensor malfunction.

How do I fix a P1D30 diagnostic trouble code?

To fix P1D30: Check the oil level and condition. Change oil and oil filter. Check the operation of the cooling system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1D30?

Limited driving only, diagnose soon

How much does it cost to fix P1D30?

The estimated repair cost for P1D30 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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