GWM hybrid high-voltage harness shielding-ring recall: communication faults need diagnosis

GWM hybrid high-voltage harness shielding-ring recall: communication faults need diagnosis

If a GWM hybrid displays several warnings and a repair quotation immediately lists an engine or transmission controller, check this high-voltage harness shielding-ring recall first. The notice connects communication abnormalities, reduced torque and cooling behaviour to the same shielding issue. It gives the workshop a lead to investigate before deciding whether physical parts are needed.

A shielding-ring issue may appear as system communication trouble

Australian notice REC-006516 says the high-voltage harness shielding ring may not be correctly grounded, reducing electromagnetic shielding and potentially interfering with engine and transmission control-system communication. Possible effects include warning lamps, reduced vehicle torque and affected hybrid-system cooling performance. [Official defect description][S02]

A control-system communication fault therefore does not justify ordering a controller by fault name alone. The notice points to harness shielding checks; it does not establish that every controller reporting a code has failed.

Consider power and cooling behaviour together

If reduced power and changed cooling behaviour occur together, retain that combination in the service record. Treating one as an engine issue and the other as a pump issue, then quoting two assemblies separately, may overlook the common lead in the notice.

This does not mean every relevant warning comes from the shielding ring. First verify action eligibility, have the authorised party inspect and complete the correction, then decide on additional repairs from any remaining symptoms and findings.

This is not an instruction to add a ground wire to a high-voltage harness

The notice requires affected vehicles to attend an authorised dealer. Repair purchasers should first obtain the applicable manufacturer work requirements, rather than reduce inadequate grounding to adding a wire or disconnecting high-voltage parts using generic photographs.

If the final job involves a harness or another physical part, explain the findings and repair basis. The word “grounding” alone identifies neither a part model nor a substitute repair.

Scope and verification

This article is limited to Australia, REC-006516 / 8825BC9, originally published Dec 24, 2025. The notice year is 2025 and it covers Cannon Alpha PHEV, Tank 300 HEV and Tank 500 HEV/PHEV, totalling 1,445 vehicles; this total is not divided into per-model counts. Check individual vehicles against the [official VIN list][V72]. Do not extend the scope to other powertrains or markets.

No public data were available for specific test values, shielding-repair steps, OE numbers or interchangeability. No individual VIN query was performed. [To be verified] Check compatibility using the VIN and local factory parts catalogue. Recall and high-voltage work must be handled by the local authorised party.

For identified ordinary component requirements, use the parts enquiry page.

[S02]: https://www.vehiclerecalls.gov.au/recalls/rec-006516
[V72]: https://www.vehiclerecalls.gov.au/sites/default/files/recall-files/REC-006516-VIN-List-1.csv