P1873: Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit Short To Battery

What does P1873 mean?

P1873 is a diagnostic trouble code indicating "Transmission Mechanical 4-Wheel Drive Axle Lock Lamp Circuit Short To Battery". The ECU is detecting a voltage reading that is below the expected range in the transmission circuit. This typically points to a wiring short, a faulty sensor, or a grounding issue.

Common causes

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

What should you do?

Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.

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Code P1873 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.

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