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Feedback on the pilot program for replacing the 9T65 9-speed automatic transmission (RPO M3V, M3W) (Fig. 6) instead of making internal repairs that is currently taking place at all GM dealerships has shown a reduction in repeat repairs for transmission replacements as well as increased quality control for returned transmission inspections.

Fig. 6

The program, which applies to 2018-2021 Enclave, Traverse; 2019-2021 Blazer; 2020-2021 Acadia, XT5, and XT6 models, is designed to reduce the number of days needed to complete vehicle repairs by favoring transmission replacement over internal repairs. After diagnosis of an internal fault, technicians are directed to replace the transmission assembly (following the necessary guidelines).

该试点计划将持续到2021年6月30日，适用于在美国销售的距离交货日期（DOD）不到18000英里、不到18个月的车辆。在课程结束时，将对如何提高变速器性能和改进维修和/或更换流程进行进一步评估。

Transmission assemblies replaced during the program are requested by the Warranty Parts Center for engineering analysis. Early results of the program have seen the root causes of several concerns determined during teardown inspections of the returned transmissions. These root causes may not have been possible to identify if the assemblies had been disassembled for repairs at the dealership.

变速器诊断

To determine a repair strategy on a 9T65 transmission – repair or replacement, first review several previously released bulletins covering 9T65 transmission operating and performance conditions. For a complete list of the bulletins as well as other Service Information documents to review, refer to Bulletin #20-NA-136. The bulletin also outlines the necessary steps to take to diagnose 9T65 transmission concerns.

If diagnosis determines internal components are the root cause or if parts are needed to complete repairs internal to the transmission, the transmission assembly should be replaced and not repaired. The repair order for the transmission replacement should include the condition, cause, and correction information as well as details on any DTCs, transmission fluid level, and fluid pressure testing.

Transmission Repairs Allowed

变速器仍可以进行某些修理，包括：

• 更换外部密封件，包括轴、阀体盖和变矩器密封件
• Replacement of transmission oil cooler, lines and accumulator
• 更换外部安装件
• Replacement of external sensors, plugs, and caps
• Replacement of external transmission controls, including lever, cables, knobs, and module
• Replacement of torque converter assembly

Refer to Bulletin #20-NA-136 for additional information about transmission diagnosis and guidelines for the transmission replacement program.

– Thanks to Mark Kevnick