Code Definition

P1860 — Automatic transmission torque converter clutch fault

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

About P1860

P1860 is a manufacturer-specific powertrain diagnostic trouble code recorded for Acura 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.

P1860 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

This code relates to the torque converter clutch control circuit. The torque converter clutch (TCC) solenoid modulates hydraulic pressure to apply or release the lockup clutch inside the torque converter, creating a direct mechanical link that improves drivability and fuel economy at cruise. The Powertrain Control Module (PCM) drives the TCC solenoid and monitors its electrical behaviour. DTC P1860 sets when the PCM detects an electrical malfunction in the TCC solenoid circuit, such as abnormal voltage, an open, a short to ground or power, or incorrect current draw during commanded operation. ...

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