Code Definition

P1850 — Automatic transmission brake band solenoid fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Acura

About P1850

P1850 is a manufacturer-specific powertrain diagnostic trouble code recorded for Acura vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1850 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This code relates to the automatic transmission brake band solenoid circuit. The brake band solenoid regulates hydraulic pressure used to apply or release a transmission brake band, which is essential for engaging and holding certain gears. The Powertrain Control Module (PCM) drives the solenoid and monitors its electrical characteristics during commanded operation. DTC P1850 sets when the PCM detects an electrical fault in the solenoid circuit, such as an open, a short, or resistance outside specification during activation. With the circuit faulted the band may not apply or release correctly,...

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