Code Definition

P1850 — Automatic transmission brake band solenoid fault

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

About P1850

P1850 is a manufacturer-specific powertrain diagnostic trouble code recorded for Honda 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 DTC is set when the Powertrain Control Module (PCM) or Transmission Control Module (TCM) detects an electrical fault in the brake band solenoid circuit. The brake band solenoid regulates hydraulic pressure that applies or releases a transmission brake band, which is part of how the gear set holds and changes ratios during shifts. P1850 logs when the control module senses an open, a short to ground, a short to voltage, or a coil resistance outside the specified range while it drives the solenoid. When the fault is present the driver may notice harsh or delayed shifts, slipping, or the tran...

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