P0850Średni
Nieprawidłowe działanie obwodu wejściowego przełącznika pozycji Park/Neutral (PNP). Sterownik PCM nie odbiera poprawnego sygnału o położeniu skrzyni biegów.
Układ napędowy
Sprawdź szczegóły →P2550
ŚredniTorque Management Request Input Signal B – Too Low. The control module detected an abnormally low voltage in the engine torque reduction request circuit (circuit B).
OBD-II (EN): Torque Management Request Input Signal B - Too Low
Code P2550 means the engine control module detected a too-low torque reduction request signal in circuit B – the system responsible for smooth gear changes. The cause could be a damaged wiring harness, a problem with the TCM or PCM module. Professional diagnosis with a factory scanner is recommended, as identifying the source of the fault requires specialized equipment.
Symptoms
Check Engine Light (MIL) illuminated; jerking or shuddering during gear changes; delayed or harsh shifting in automatic transmissions; possible transmission entry into limp mode; occasional engine power limitation during acceleration.
Possible causes
• Damaged or corroded connector/wiring harness in the torque request signal circuit (circuit B) • Short to ground in the signal wire between ECM/PCM and TCM • Faulty transmission control module (TCM) generating an incorrect request signal • PCM/ECM module fault – incorrect reading or processing of the input signal • Internal communication interference (problem with the request signal itself, not related to the CAN bus)
Affected systems
Układ zarządzania momentem obrotowymAutomatyczna skrzynia biegów (TCM)Moduł sterowania silnikiem (PCM/ECM)Obwód elektryczny sygnału żądania momentu
Related codes
P0700Wysoki
System sterowania skrzynią biegów — usterka
Układ napędowy
Sprawdź szczegóły →Does code P2550 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.