Code Definition

P1906 — Kickdown Pull Relay Open or Short Circuit to Ground

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

About P1906

P1906 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 P1906 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and 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.

P1906 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 P1906 fault code indicates that the Transmission Control Module (TCM) has detected an open circuit or a short to ground in the Kickdown Pull Relay circuit. The kickdown relay is responsible for controlling downshifts under heavy acceleration by managing solenoid operation within the transmission. If the circuit is open or grounded incorrectly, the relay cannot function properly, potentially affecting transmission performance.

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