P1860 Code: Meaning, Symptoms, Causes & Fix

Overview

Symptoms

• transmission warning message
• gear hunting
• reduced acceleration

Common causes

• Open circuit in wiring affecting tcc pwm solenoid circuit electrical/ transmission transfer case contact plate 'd' short circuit to battery
• Disconnected or loose connector
• Connector pin damage/corrosion or harness stress near related components

How to diagnose P1860

1. Confirm P1860 and capture freeze-frame data with a professional scan tool.
2. Inspect wiring, connectors, and grounds related to tcc pwm solenoid circuit electrical/ transmission transfer case contact plate 'd' short circuit to battery for obvious defects.
3. Use a continuity test from module pin to component to identify opens/high resistance.
4. Check for related DTCs to identify the root-cause chain before replacing parts.
5. After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1860

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P1860?

Most vehicles can be driven short-term with P1860, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

1. Repair obvious wiring/connector faults first to prevent repeat parts replacement.
2. Address the root fault mode (open) in the tcc pwm solenoid circuit electrical/ transmission transfer case contact plate 'd' short circuit to battery circuit/system.
3. Apply the required relearn/adaptation procedure if specified by service information.
4. Road-test and verify P1860 remains cleared under the conditions that originally set the code.

Fix options

• Clear corrosion and protect terminals.
• Restore continuity and verify pin tension.
• Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$300-$1500

Common mistakes when diagnosing P1860

• Replacing parts without verifying voltage, ground, and signal integrity first.
• Ignoring related stored/pending codes that indicate upstream faults.
• Skipping post-repair verification drive cycle and readiness checks.

P1860 in common vehicles

P1860 appears across makes such as Nissan, Hyundai, Kia, Volkswagen. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1860?

P1860 is commonly set by open faults affecting tcc pwm solenoid circuit electrical/ transmission transfer case contact plate 'd' short circuit to battery.

How much does it cost to fix P1860?

For P1860, repair costs are typically $300-$1500 depending on exact root cause, labor rates, and part quality.

Can I clear P1860 without repair?

You can clear P1860 temporarily, but the code usually returns until the underlying fault is corrected.

Helpful tools

• Estimate repair cost
• Decode your VIN
• Calculate fuel cost