Code Definition

P1814 — Torque converter clutch (TCC) overstress

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

About P1814

P1814 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.

P1814 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 DTC sets when the Transmission Control Module (TCM) determines that the torque converter clutch (TCC) has been subjected to stress conditions exceeding calibrated limits. This may involve excessive TCC slip, prolonged engagement under high load, or repeated harsh engagements, indicating that the TCC or its apply circuit is not performing within design parameters. The TCM accumulates a measure of clutch stress and logs this code to protect the converter and transmission from heat damage. The driver may notice a shudder on lockup, slipping at cruise, or the TCM inhibiting torque converter l...

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