Code Definition

P1907 — Kickdown Hold Relay Open or Short Circuit to Ground

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

About P1907

P1907 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 P1907 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.

P1907 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 P1907 fault code indicates that the Transmission Control Module (TCM) has detected an open circuit or a short to ground in the Kickdown Hold Relay circuit. This relay helps maintain the downshift command during heavy acceleration to ensure proper transmission response. When the circuit is open or shorted to ground, the relay may fail to activate or remain engaged, affecting transmission performance.

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