Code Definition

P1550 — Torque Converter Clutch Solenoid Valve

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

About P1550

P1550 is a manufacturer-specific powertrain diagnostic trouble code recorded for Nissan 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

The torque converter clutch (TCC) solenoid valve on Nissan vehicles controls hydraulic apply of the lock up clutch inside the torque converter, allowing a direct mechanical link between the engine and transmission to reduce slip and improve fuel economy at cruise. The transmission control module, or the ECM on integrated systems, energises the solenoid to engage and release the converter clutch. DTC P1550 sets when the control module detects an electrical fault in the TCC solenoid valve circuit, such as an open or short, so the solenoid does not respond as commanded. Symptoms can include no to...

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