ATRACYPART VVT Exhaust Solenoid for Chevy/GMC/Buick 2.8L–4.2L — Replaces 12615873, Tested Aluminum, 12‑Month Warranty

ATRACYPART Exhaust VVT Solenoid is a direct-replacement variable valve timing camshaft actuator designed to restore VVT function and improve engine responsiveness on compatible GM and Isuzu vehicles.

This replacement VVT (variable valve timing) solenoid is engineered for precise fit and reliable operation in a range of 2.8L–4.2L engines used by Chevrolet, GMC, Buick, Hummer and Isuzu models. Built with treated aluminum components and tested for oil flow and leakage, the unit aims to reduce the symptoms associated with a failing camshaft timing actuator: rough idle, reduced fuel efficiency and diagnostic trouble codes. It replaces OE part numbers such as 12615873 and 12602516 and includes a 12-month warranty for added confidence.

How will this solenoid affect drivability and idle behavior?

Replacing a worn VVT solenoid can reduce unstable idle and restore smoother low-speed operation by allowing the engine control system to vary cam timing as designed. You may notice improved throttle response and steadier RPM at rest once the solenoid is functioning properly.

• Restores controlled camshaft phasing for smoother idle and transitions
• Helps eliminate rough-idle symptoms caused by restricted or sticking valves
• Supports consistent oil flow to VVT system for reliable timing adjustments

Which vehicles and engines does this part fit?

This ATRACYPART VVT solenoid fits a wide range of GM and Isuzu vehicles equipped with 2.8L, 2.9L, 3.5L, 3.7L and 4.2L engines across model years in the 2000s and early 2010s. Always verify your vehicle’s OEM part number or engine size against the listed replacements before purchasing.

• Chevrolet Trailblazer (2002–2009), Trailblazer EXT (2002–2006)
• Chevrolet Colorado (2004–2012) and GMC Canyon (2004–2012) with listed engines
• GMC Envoy series, Buick Rainier, Hummer H3/H3T, Isuzu Ascender and select i-series models

What quality and testing standards were used for this replacement part?

The solenoid uses precision-machined aluminum valve bodies and surface-treated spool valves to reduce wear and minimize sticking under oily conditions. Each unit is inspected and tested for oil flow, pressure and leakage to meet long-term service expectations.

• Surface-treated spool and aluminum valve body for increased wear resistance
• OE-style mounting and connector design to ensure a secure fit
• Individual oil-flow and leakage testing plus a 12-month warranty

Can this part clear common VVT-related codes and which OEM numbers does it replace?

This replacement is manufactured to address mechanical and hydraulic causes of common VVT codes by restoring proper oil control to the cam actuator. It is listed as a replacement for several OEM part numbers so it can be used when those specific parts are shown in your vehicle’s repair manual or diagnostics.

• Replaces OEM numbers: 12615873, 12602516, 12568078, 12576768, 12597025 and others
• Designed to resolve issues that produce VVT-related codes such as P0013, P0014, P0016, P0017 when caused by the solenoid
• 12-month warranty covers manufacturing defects and service concerns

Who is this for: Technicians, DIY mechanics and vehicle owners who need a dependable, OE-style replacement VVT solenoid for late-model GM and select Isuzu vehicles. Choose this part if your vehicle shows timing-related symptoms, a matching OEM part number, or diagnostic codes pointing to exhaust VVT/camshaft actuator operation. If you’re unsure about fitment, compare your original part number or consult a repair manual before ordering; ATRACYPART provides customer support and a 12-month warranty for added assurance.