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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Automatic Transmission - JATCO CVT) >> Diagnostic Information and Procedures >> DTC P1790: Transmission Control Module Checksum Error - ROM Assembly >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

At each ignition ON, the transmission control module compares the calibration data stored in the CVT ROM assembly with the calibration data stored in the transmission control module. If the ROM assembly data does not agree with the transmission control module data a checksum error is logged and DTC P1790 is set.

This is an internal fault of the CVT ROM assembly in the transmission detected by the transmission control module. No external circuits are involved.

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