P1859 — Transmission Transfer Case Contact Plate 'D' Open Circuit

What Does P1859 Mean?

P1859 is a manufacturer-specific diagnostic trouble code: Transmission Transfer Case Contact Plate 'D' Open Circuit. This code applies to OTHER, VOLKSWAGEN 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 P1859

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Transmission Transfer Case Contact Plate 'D' Open readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Transmission Transfer Case Contact Plate 'D' Open circuit (damaged, chafed, or corroded)
🔍 Faulty Transmission Transfer Case Contact Plate 'D' Open connector or terminal
🔍 Failed Transmission Transfer Case Contact Plate 'D' Open
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P1859 mean?

P1859 indicates: Transmission Transfer Case Contact Plate 'D' Open Circuit. The vehicle's computer has detected that the Transmission Transfer Case Contact Plate 'D' Open is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1859?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1859 for extended periods may cause additional problems.

How much does it cost to fix P1859?

Repair costs for P1859 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 and repair Transmission Transfer Case Contact Plate 'D' Open wiring and connectors
🔧 Replace faulty Transmission Transfer Case Contact Plate 'D' Open

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.

P1859: Transmission Transfer Case Contact Plate 'D' Open Circuit