P1783: Transmission Fluid Temperature High Input

MAZDA NISSAN FORD LINCOLN MERCURY OTHER

Severity

Medium

System

Manufacturer-Specific Powertrain

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

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
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2
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.