Code Definition

P1918 — Transmission Range Display Circuit Malfunction

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

About P1918

P1918 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 P1918 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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.

P1918 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

The P1918 fault code indicates that the Transmission Control Module (TCM) has detected a malfunction in the Transmission Range Display Circuit. This circuit is responsible for displaying the selected gear position on the instrument panel or shift indicator. A malfunction suggests that the signal from the transmission range sensor (or related circuits) is erratic, missing, or out of expected parameters.

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