P1860 — TCC PWM Solenoid Circuit Electrical/ Transmission Transfer Case Contact Plate 'D' Short Circuit To Battery

What Does P1860 Mean?

P1860 is a manufacturer-specific diagnostic trouble code: TCC PWM Solenoid Circuit Electrical/ Transmission Transfer Case Contact Plate 'D' Short Circuit To Battery. This code applies to OTHER, VOLKSWAGEN, BUICK, CADILLAC, CHEVY 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 P1860

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic TCC PWM Solenoid readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in TCC PWM Solenoid circuit (damaged, chafed, or corroded)
🔍 Faulty TCC PWM Solenoid connector or terminal
🔍 Failed TCC PWM Solenoid
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P1860 mean?

P1860 indicates: TCC PWM Solenoid Circuit Electrical/ Transmission Transfer Case Contact Plate 'D' Short Circuit To Battery. The vehicle's computer has detected that the TCC PWM Solenoid is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1860?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1860 for extended periods may cause additional problems.

How much does it cost to fix P1860?

Repair costs for P1860 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 TCC PWM Solenoid wiring and connectors
🔧 Replace faulty TCC PWM Solenoid

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.

P1860: TCC PWM Solenoid Circuit Electrical/ Transmission Transfer Case Contact Plate 'D' Short Circuit To Battery