Code Definition

P1550 — Electronic Throttle Control - Reduced Power

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

About P1550

P1550 is a manufacturer-specific powertrain diagnostic trouble code recorded for Vauxhall vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P1550 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

DTC P1550 is a manufacturer specific code on Vauxhall and Opel vehicles indicating that the Engine Control Module (ECM) has detected a fault within the electronic throttle control (ETC) system and has commanded a reduced power or limp home mode to keep the vehicle safe. The ETC system replaces a mechanical throttle cable with an electric throttle body motor that the ECM drives, while throttle position sensors and accelerator pedal position sensors continuously feed back the commanded and actual throttle openings. P1550 typically sets when these feedback signals disagree, when the throttle moto...

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