Quick Answer
Campaign P6305 identifies certain 2011–2013 Infiniti QX56 and M56 vehicles for timing-chain replacement. It is not a statement that every vehicle in those model years is eligible or currently needs the repair. An Infiniti retailer can check campaign status by VIN. New rattling, whining, timing codes, poor running, or oil-pressure warnings still require diagnosis even when the campaign does not apply.
What Was Infiniti Campaign P6305?
Infiniti service document ITB16-015a describes a voluntary service campaign for certain 2011–2013 QX56 and 2011–2013 M56 vehicles. The published procedure replaces timing chains and related components on eligible vehicles.
Service campaigns differ from general repair bulletins and safety recalls. Current eligibility, completion, and coverage must be checked through Infiniti using the exact VIN rather than assumed from the year alone.
How Do You Check Whether the Campaign Applies?
Locate the 17-character VIN on the dashboard, driver's door label, registration, or insurance card. Contact an authorized Infiniti retailer and ask it to check the vehicle's campaign history and completion status.
The public Infiniti recall and campaign resources and NHTSA recall lookup are useful starting points, but a service campaign may require retailer confirmation.
Which Timing-Chain Symptoms Deserve Inspection?
Possible concerns include a new front-engine rattle or whine, timing-related fault codes, rough running, loss of power, hard starting, or metal debris. Similar sounds can come from belts, pulleys, injectors, exhaust, or other engine components.
A red oil-pressure warning, heavy knock, severe misfire, or sudden power loss is urgent. Shut the engine off and arrange safe transport rather than driving to reproduce the noise.
How Is a Timing Concern Diagnosed?
The technician listens during cold and warm operation, scans camshaft and crankshaft correlation data, checks oil level and pressure when indicated, and inspects accessories that can imitate internal noise. Model-specific service information defines further measurements.
Campaign eligibility and mechanical diagnosis are related but separate questions. A vehicle can be ineligible for the campaign and still need a repair, or show no current fault after a campaign was completed.
Why Is Timing-Chain Repair Extensive?
The chains and guides are located behind the front engine cover and must remain precisely synchronized with the crankshaft and camshafts. Access requires removal of surrounding components, careful sealing, fluid replacement, and verification after reassembly.
An estimate should explain which components are included, why the repair is recommended, what evidence confirmed it, and whether the campaign or any warranty applies.
Legacy Infiniti V8 Diagnosis Near Metro Atlanta
Fastlane can evaluate engine noise, oil-pressure concerns, timing codes, and maintenance needs on QX56 and M56 vehicles in Hiram, Smyrna, and Woodstock. Campaign confirmation and any covered campaign remedy should begin with Infiniti.
For non-campaign mechanical diagnosis, schedule online through Infiniti service or review Fastlane's engine repair and diagnostic service.
Infiniti QX56 and M56 Timing-Chain Questions
VIN eligibility, completion history, and current mechanical condition must be considered separately.
Which vehicles were named in campaign P6305?
Is P6305 a safety recall?
Will the repair still be free?
Does timing-chain noise always mean the campaign problem?
Can Fastlane diagnose a QX56 or M56 engine noise?
Separate Campaign Eligibility From the Current Engine Condition
Use Infiniti for VIN campaign confirmation, and schedule online with Fastlane for non-campaign engine-noise and timing-system diagnosis in Hiram, Smyrna, or Woodstock.