OBD Guide
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P1900

Output Shaft Speed Circuit Intermittent Malfunction

P1900 is an OBD-II diagnostic trouble code meaning: Output Shaft Speed Circuit Intermittent Malfunction. Common causes: damage to sensor wiring or connectors, output shaft speed sensor malfunction. Estimated repair cost: $17–56.

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

Symptoms

  • Incorrect gear shifting
  • Hard shifts
  • Enabling emergency transmission mode
  • Check Engine Light Flashing
  • Reduced vehicle dynamics

Causes

  • Damage to sensor wiring or connectors
  • Output shaft speed sensor malfunction
  • Circuit Grounding Problems
  • Malfunction of the transmission control unit
  • Mechanical damage to the output shaft

How to Fix

  1. Check the integrity of the sensor wiring and connectors
  2. Test the output shaft speed sensor
  3. Check resistance and voltage in the circuit
  4. Replace sensor if necessary
  5. Reset error codes after repair

Related codes

P1901P0720P0722

Error P1900 by Vehicle Brand

FordLincolnMazdaMercuryNissan

FAQ

What does the P1900 code mean?

P1900 is an OBD-II diagnostic trouble code that indicates: Output Shaft Speed Circuit Intermittent Malfunction

What causes a P1900 error code?

The most common causes of P1900 include: Damage to sensor wiring or connectors; Output shaft speed sensor malfunction; Circuit Grounding Problems; Malfunction of the transmission control unit.

How do I fix a P1900 diagnostic trouble code?

To fix P1900: Check the integrity of the sensor wiring and connectors. Test the output shaft speed sensor. Check resistance and voltage in the circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1900?

Limited driving only, diagnose soon

How much does it cost to fix P1900?

The estimated repair cost for P1900 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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