GM LM2 turbo actuator fasteners: replacement is conditional. See the manufacturer document, vehicle conditions, exclusions and questions for a qualified shop before assuming a repair.
This is a research summary of a manufacturer communication, not a diagnosis for your car, a DIY repair procedure or confirmation of warranty or recall eligibility. No qualified technician has approved a repair for your individual vehicle here.
This historical communication is conditional. The current revision, VIN/build eligibility, measured diagnosis and any warranty or recall decision are not established here. Ask the manufacturer or a qualified shop to check the complete current document.
Read the General Motors original: LM2 turbocharger actuator fasteners and loss of power · Check open recalls by VIN at NHTSA Source date: 2022-02; research checked: 2026-11-01.
What prompted this manufacturer document
- Loose actuator fasteners can accompany loss of power and the listed turbo-control codes.
Which vehicle conditions must be checked
Each row below retains its own conditions. Do not combine engines, years or models across rows to create new applications. A listed model is not proof that a particular VIN is affected.
- Chevrolet Silverado 1500 · 2020, 2021 · 3.0L LM2
- GMC Sierra 1500 · 2020, 2021 · 3.0L LM2
- Chevrolet Silverado 1500 LTD / New · 2022 · 3.0L LM2; J21 Limited versus J22 New; source uses 12th VIN character <=4 versus >=5
- GMC Sierra 1500 Limited / New · 2022 · 3.0L LM2; J21 Limited versus J22 New; source uses 12th VIN character <=4 versus >=5
- The inspection of all three actuator fasteners is the deciding condition.
- If all are seated, this bulletin does not establish the cause; return to normal diagnosis.
Codes recorded in this document
A root listed only as an appearance has no separately verified meaning here. Preserve every suffix and module name; a shared root does not transfer a repair branch to another vehicle.
| Root | Raw form | Meaning in this source, if established |
|---|---|---|
| P003A | P003A | Appears in the document; individual meaning not verified |
| P0046 | P0046 | Appears in the document; individual meaning not verified |
| P0299 | P0299 | Appears in the document; individual meaning not verified |
| P0234 | P0234 | Appears in the document; individual meaning not verified |
What an owner can record safely
- Record low-power conditions and prior turbo work.
What the source does not prove
- Do not use a guessed torque or retighten an inaccessible hot assembly based on this summary.
- A code or message alone does not establish a failed part, a safe-to-drive decision or an approved repair for this VIN.
- A service bulletin is not automatically a recall or free warranty repair. Confirm current eligibility directly.
Questions for the repair shop
- Were all three fasteners assessed, and did the result actually meet the replacement branch?
- Does a later revision or a current recall change the source's original advice?
- What measurement or inspection confirms the cause, and how will the repair be verified?
Read the original record
The linked communication may be revised after the research date. Compare its document number, exact vehicle table, diagnostic preconditions and exclusions with a qualified technician. This page paraphrases selected facts and does not reproduce the manufacturer procedure.
Sources and scope
- General Motors — LM2 turbocharger actuator fasteners and loss of power (22-NA-021) Document: 2022-02 · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.