Hybspec

P1700

Wysoki

Transmission control module (TCM) request circuit fault. Manufacturer-specific code related to problems in the automatic transmission control system.

OBD-II (EN): Transmission Control Module (TCM) Request Circuit Fault

Code P1700 is a manufacturer-specific fault related to the automatic transmission control system. It may indicate a communication problem between controllers, a damaged speed sensor, or a TCM module failure – the specific cause depends on the vehicle brand. Due to the complexity of diagnostics, a visit to a service center with a professional diagnostic scanner is recommended.

Symptoms

Check Engine light (MIL) illuminated Problems with gear shifting or transmission locked in limp mode Jerking or delayed responses when changing gears Possible incorrect speed or RPM readings In some vehicles (Opel Easytronic): inability to engage a gear

Possible causes

Damage or interference in communication between TCM and ECM (engine controller) Damaged shaft speed sensor (Toyota/Lexus) Fault in the throttle position sensor circuit in the automatic transmission system Damaged wiring or connectors of the TCM module Damage to gear actuators or clutch system (Easytronic) Power supply problem for the TCM module Internal error of the transmission controller

Affected systems

Automatyczna skrzynia biegówModuł sterowania skrzynią biegów (TCM)Moduł sterowania silnikiem (ECM)Sieć CANCzujnik prędkości wału wyjściowegoCzujnik położenia przepustnicy

Related codes

Does code P1700 require professional diagnostics?

The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.