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P1774 Infiniti

P1774 Infiniti - Low Coast Brake Solenoid Valve Function

Possible causes
- Faulty Low Coast Brake Solenoid Valve
- Low Coast Brake Solenoid Valve harness is open or shorted
- Low Coast Brake Solenoid Valve circuit poor electrical connection
Tech notes
There is a factory service bulletin for the 2003–2010 Infiniti vehicles with 5-Speed A/T for the P1774 code. The bulletin recommends replacing the Transmission Valve Body to fix the problem.

2003–2010 Infiniti vehicles with 5-Speed A/T OBDII Code P1774
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1774 Infiniti Description

Low coast brake solenoid valve is turned “ON” or “OFF” by the Transmission Control Module (TCM) in response to signals sent from the PNP switch, vehicle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the optimum position.

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