P1900 — Output Shaft Speed (OSS) Circuit Intermittent Malfunction

What Does P1900 Mean?

P1900 is a manufacturer-specific diagnostic trouble code: Output Shaft Speed (OSS) Circuit Intermittent Malfunction. This code applies to FORD, LINCOLN, MERCURY, MAZDA, NISSAN vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1900

⚠️ Check Engine Light (MIL) illuminated
⚠️ Output Shaft Speed (OSS) signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Reduced engine performance

Common Causes

🔍 Loose or intermittent connection at Output Shaft Speed (OSS)
🔍 Wire chafing causing intermittent contact
🔍 Output Shaft Speed (OSS) failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P1900 mean?

P1900 indicates: Output Shaft Speed (OSS) Circuit Intermittent Malfunction. The vehicle's computer has detected that the Output Shaft Speed (OSS) is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1900?

Yes, P1900 is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P1900?

Repair costs for P1900 typically range from $30 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and reseat all Output Shaft Speed (OSS) connectors
🔧 Repair chafed or damaged wiring in Output Shaft Speed (OSS) circuit
🔧 Replace Output Shaft Speed (OSS) if failing intermittently

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1900: Output Shaft Speed (OSS) Circuit Intermittent Malfunction