P1783 — Transmission Fluid Temperature High Input

What Does P1783 Mean?

P1783 is a manufacturer-specific diagnostic trouble code: Transmission Fluid Temperature High Input. This code applies to MAZDA, NISSAN, FORD, LINCOLN, MERCURY 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 P1783

⚠️ Check Engine Light (MIL) illuminated
⚠️ Transmission Fluid Temperature High Input not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty Transmission Fluid Temperature High Input
🔍 Wiring or connector issue in Transmission Fluid Temperature High Input circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1783 mean?

P1783 indicates: Transmission Fluid Temperature High Input. The vehicle's computer has detected that the Transmission Fluid Temperature High Input is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1783?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1783 for extended periods may cause additional problems.

How much does it cost to fix P1783?

Repair costs for P1783 typically range from $80 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 Transmission Fluid Temperature High Input and related wiring
🔧 Replace faulty Transmission Fluid Temperature High Input

1
Find your vehicle above
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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.

P1783: Transmission Fluid Temperature High Input