P1874: Transmission Automatic Hall Effect Sensor Power Circuit Failure

What does P1874 mean?

P1874 is a diagnostic trouble code indicating "Transmission Automatic Hall Effect Sensor Power Circuit Failure". A sensor in the transmission is reporting abnormal data or has lost communication with the ECU. Sensors can fail due to age, contamination, heat exposure, or wiring issues.

Common causes

• Low or degraded transmission fluid
• Worn clutch packs or bands
• Faulty shift solenoid
• Wiring issue to the transmission control module
• Failing torque converter

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.

Get a diagnosis for YOUR car

Code P1874 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.

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