Code Definition

P1823 — Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit To Ground

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

About P1823

P1823 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1823 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

P1823 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 Transfer Case Control Module (TCCM) detects a short to ground in the clockwise shift relay coil control circuit. The clockwise shift relay controls the shift motor direction in the transfer case, and its coil is energised by a controlled voltage. A short to ground causes continuous or failed activation, abnormal current flow, or an inability to actuate the relay, leading the TCCM to log P1823.

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