Escalade IQ Owners Get Rear Suspension Noise Bulletin
If your 2025-2026 Escalade IQ or 2026 IQL hums or clunks from the rear over bumps, ask your dealer to check bulletin PIT6558.
Updated on Nov. 3, 2026 in Electric Vehicles
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General Motors has issued an internal service bulletin, PIT6558, after investigating a rear suspension noise in Cadillac Escalade IQ and IQL electric models, with the bulletin covering 2025-2026 Escalade IQ and 2026 Escalade IQL vehicles.
Why it matters
Owners of affected Escalade IQ and IQL models may hear a noise from the rear over bumps or while turning, and the bulletin suggests the rear upper control arm bushings as a possible source. GM's note that technicians may struggle to pinpoint the sound means owners may need to press for a proper diagnosis rather than assume the problem is minor.
The bulletin covers 2025-2026 Escalade IQ and 2026 Escalade IQL models, and also lists 2024-2026 Chevy Silverado EV and GMC Sierra EV models. It was created October 15, 2026, and the article reporting on it appeared 19 days later.
The players
General Motors
Detroit automaker that sells the Cadillac Escalade IQ and IQL electric SUVs and the Chevy Silverado EV and GMC Sierra EV trucks.
Cadillac
GM's luxury brand, whose Escalade IQ and IQL electric SUVs are the subject of this bulletin.
The details
Owners may hear the noise from the rear when driving over bumps or turning. The bulletin points to the rear upper control arm bushings as a possible source and recommends that technicians test the bushing using chassis ears or a PicoScope. If testing confirms the bushing as the source, the upper control arm will need to be replaced, and GM Engineering is developing an update for the noise.
Timeline
October 15, 2026: bulletin PIT6558 was created.
October 2026: bulletin PIT6558 was dated.
November 3, 2026: an article about the GM investigation was published.
The Home Front
Electric SUVs and trucks like the Escalade IQ and Silverado EV are increasingly common in U.S. driveways, so suspension-related service bulletins are relevant to household maintenance budgets. Service bulletins like PIT6558 are typically dealer-facing, so owners often learn of them only when they bring a vehicle in with a complaint.
If you own a 2025-2026 Escalade IQ, a 2026 Escalade IQL, or a 2024-2026 Silverado EV or Sierra EV and notice a rear noise over bumps or during turns, schedule an inspection with a GM dealer service department and ask them to check bulletin PIT6558. Keep your vehicle's service records on file so you can show any suspension work performed under warranty.
The takeaway
A rear noise on a 2025-2026 Escalade IQ or related GM electric model may be a worn upper control arm bushing rather than a serious safety defect, but it is worth having a dealer confirm the cause. Ask the service advisor to reference bulletin PIT6558 when you book the visit.
Further reading
For more on how electric trucks and SUVs are changing vehicle ownership, browse our Electric Vehicles coverage.
Source note: This article includes information reported by GM Authority.
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