2011 Infiniti QX56 engine problems

Filed Jul 20, 2026 · Engine · NC

Need to know if there are recalls on the Q56 Infinite for the Catalytic Converter Failure. This truck had 2 and this is the second one that seems to be faulty and the truck only had 162000 miles The 1st one faulted at 151000 2024 The Infinite 2011 Q56 has been known for faulty Catalytic Converter Failure and nothing was done to recall and fix. The truck had 2 Catalytic Converters, the 1st one went out in 2024 @ 152000 miles, now it looks like my engine light is back on with error code P0420 Converter malfunction. I searched internet and it was noted that 2011 have had enormous reports about this issue. This doesn’t make since there is no recall when it is noted that the 2011 Q56 had history of faulty Catalytic Converter Failure. This cost to replace and repair is enormous and this type of part replacement repair should not be happening at 152000-162000 miles. This needs to be investigated and recall issued immediately.

Filed Jun 25, 2023 · Engine · TX

Unknown. Timing chain issue. When car is started it makes a noise for about 10 min then goes away

Filed Jun 2, 2023 · Engine, Fuel system · MS

Catalytic Converter, A/F Sensor failed on the interstate when I was driving with kids in the car. Took vehicle to the nearest dealer only to be told that this is a known problem with these vehicles and it was going to cost me $3,100 to repair.

Filed Mar 12, 2022 · Engine · VA

I'm currently dealing with the timing chain nightmare so many others have had and are having. Of course just as most of the others I'm out of warranty and really frustrated that infiniti hasn't stepped up to the plate to address the problem properly as opposed to renaming the qx56 to qx 80 to save themselves, leaving consumers scrambling with expensive time consuming fixes to a known defect on their part. Where's the accountability on their part, do a certain number of people have to die or be injured before the consumers are provided with the proper assistance? Who really looks out for us? A recall was done in 2016 obviously they need to expand the VIN number

Filed Jan 18, 2022 · Engine · 140,000 miles · TX

The contact owns a 2011 Infiniti QX56. The contact stated while driving at various speeds, the vehicle would vibrate violently. Additionally, the vehicle had experienced intermittent power loss and had gone into limp mode. The contact stated that the check engine warning light was illuminated. The vehicle was taken to a local mechanic where it was diagnosed with needing the timing chain replaced. The vehicle was not repaired. The manufacturer was informed of the failure and informed the contact that the VIN was not included in a recall. The failure mileage was approximately 140,000.

Filed May 7, 2021 · Engine · 161,798 miles · SC

Code ref tsbno. 16-015 timing chains replacement manufacturer defect and recall

Filed Jan 15, 2021 · Engine, Transmission · 67,000 miles · TX

Tl* the contact owns a 2011 infiniti qx56. The contact stated while driving 65 MPH, the check engine warning light illuminated. The contact continued driving to his destination. The vehicle was taken to the local dealer southwest infiniti (10495 southwest fwy, houston, tx 77074, (832) 742-1614) where it was diagnosed with needing the catalytic converter to be replaced. The vehicle was repaired however, 3 years later he experienced the failure. The vehicle was taken back to dealer, where it was diagnosed with needing the catalytic converter to be replaced for a second time. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 67,000.

Filed Nov 3, 2020 · Acceleration, Engine · 82,000 miles · FL

Tl* the contact owns a 2011 infiniti qx56. The contact stated while driving 40 MPH, the accelerator pedal was depressed however, the vehicle failed to respond and decelerated without warning. The vehicle was coasted to the shoulder of the roadway and turned off and restarted however, the failure persisted. The vehicle was towed to the residence. The vehicle was not diagnosed nor repaired. A dealer was not contacted. The manufacturer was not made aware of the failure. The failure mileage was approximately 82,000.

Filed Sep 27, 2020 · Engine · 69,577 miles · MD

Catalytic converter failure on driver's side resulting in check engine light.

Filed Sep 6, 2020 · Engine, Fuel system · 121,089 miles · CA

On june 1st 2020 I took my 2011 infiniti qx56 to the shop for having the code p0087. The shop told me that I should take it to the dealership because the problems the vehicle is having are recalled under voluntary safety recall campaign. When I called my local infiniti dealership they told me my VIN # doesn't doesn't show as recalled. They dealership provided me with the phone number of infiniti consumer affairs. I called infiniti affairs and told them about my vehicle they told me that they were sorry but my VIN doesn't show up on their system. The bottom line is that every single thing that I researched and find the wrong of the vehicle comes back with a voluntary recall. Like the fuel system, timing chain, vvt solenoids, high pressure fuel pump. I use vehicle in the city and highway.