The code indicates the Powertrain Control Module has detected a software version or calibration mismatch with the secondary Gear Shift Control Module (GSCM). This incompatibility prevents proper validation of the electronic shifting system, typically forcing the transmission into a failsafe mode until the configuration is corrected.
A replacement module with the wrong part number or software version for the specific vehicle configuration will report incompatibility. This commonly occurs when used, aftermarket, or incorrect model-year components are installed.
Following module replacement or a battery disconnect, the Gear Shift Control Module may require specific calibration or coding to match the PCM software level. Failure to perform this step results in a version mismatch flag.
Internal memory corruption caused by voltage spikes, failed updates, or hardware degradation can cause the module to report an invalid software identifier to the PCM.
Weak batteries, faulty grounds, or charging system faults can cause erratic communication or incomplete data transmission, leading the PCM to interpret garbled messages as a software version error.
Opens, shorts, or high resistance in the Controller Area Network circuits between the PCM and Gear Shift Control Module can corrupt the software version data packets during exchange.
While rare, an internal PCM fault could cause misinterpretation of valid module data. This should only be considered after all other causes are eliminated and the PCM software is confirmed current.
No. This code specifically references the Gear Shift Control Module's software, not the PCM. Replacing the PCM is almost never the correct repair; the solution lies in ensuring the correct transmission control hardware is installed and properly programmed to match the vehicle.
Yes. Low voltage during cranking or operation can corrupt module memory or interrupt programming sequences, causing temporary software incompatibility flags. Proper power restoration and a module reset may clear the code, though reconfiguration may be required.
If the gear shift module was disconnected, replaced, or the battery was disconnected during service, the module may have lost its calibration or the replacement unit may be the incorrect part number. The module often requires dealer-level programming to match the vehicle's specific configuration.
No. The vehicle typically enters limp mode with limited or no gear selection capability. Operating the vehicle could create unsafe driving conditions or cause mechanical damage to the transmission; it should be diagnosed before further operation.