P1822: Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit To Battery

What does P1822 mean?

P1822 is a diagnostic trouble code indicating "Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit To Battery". The ECU is detecting a voltage reading that is below the expected range in the ignition system circuit. This typically points to a wiring short, a faulty sensor, or a grounding issue.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Harsh or delayed gear shifts
• Transmission slipping
• Vehicle stuck in one gear (limp mode)
• Intermittent warning lights

Common causes

• Damaged or corroded wiring harness
• Loose or disconnected electrical connector
• Failed ignition system sensor or actuator
• Blown fuse in the related circuit
• Poor ground connection

What should you do?

This code sits in a powertrain control module. The engine or transmission can drop into limp mode or cut out, which is its own hazard in traffic or on a motorway. Get it diagnosed before your next trip rather than waiting for the next service.