Code Definition

P1887 — TCC Release Switch malfunction

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

About P1887

P1887 is a manufacturer-specific powertrain diagnostic trouble code recorded for GM 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.

P1887 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 release switch is a hydraulic pressure switch in the GM transmission that tells the Transmission Control Module whether the converter clutch is applied or released by sensing TCC apply oil pressure. The module uses this feedback to confirm the converter clutch disengages during deceleration, idle, and braking, where lockup must release to avoid stalling. DTC P1887 sets when the switch signal is implausible or stuck in one state, or when it does not agree with the commanded TCC solenoid operation over a calibrated period. The fault can be electrical in the switch or ...

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