2012 Infiniti QX56: check engine light

Filed Mar 4, 2026 · Engine · 175,000 miles · SC

The contact owns a 2012 Infiniti QX56. The contact stated that while driving at 56 MPH, the vehicle slowed down and failed to respond as intended. An oil change was performed; however, the failure persisted. The contact stated that the high-pressure fuel pump was leaking, causing the timing chain to fail. The check engine warning light illuminated, and the failure progressed, causing the vehicle to stall. The vehicle was not diagnosed or repaired by a dealer or independent mechanic. The vehicle failed on the side of the road and was towed to the residence. The contact used an OBD scanner and retrieved DTC: P0021, P0011, and P0300. The manufacturer was contacted about the failure, and Customer Service Program Number: P6305. The VIN was provided, and the contact was informed that the vehicle was not covered under the campaign and that the campaign had expired. The failure mileage was approximately 175,000.

Filed Nov 4, 2022 · TX

I have an engine light on as a result of 2 bad catalytic converters that need to be replaced. The vehicle has been inspected the infinite dealer maintenance dept. This poses a safety risk of this vehicle shutting down in the midst of driving

Filed May 27, 2022 · Engine · 87,000 miles · NY

The contact owns a 2012 Infiniti QX56. The contact stated while driving 30 MPH and depressing the accelerator pedal, the vehicle started shaking violently. The contact stated that the check engine warning light was illuminated. The contact took the vehicle to the local dealer, where it was diagnosed with needing the timing chain to be replaced. The vehicle was not repaired and continued to experience the failure. The manufacturer had been informed of the failure. The failure mileage was approximately 87,000.

Filed Aug 5, 2021 · Engine · MI

I own a 2012 QX56. Check engine light comes on and I take it to the dealer. It's the Catalyst System Efficiency Below Threshold (catalytic covers - P0430 code) I was warned before I bought this vehicle about the cats going bad. Infiniti dealer, that I purchased the truck from said "this vehicle has been serviced at an Infiniti dealer since day one. Every possible service that was needed was completed. The owner took immaculate car of this truck. You won't have any issues." So tell me, if this vehicle was driven exactly how it was supposed to be and yet at 113K miles the cats go bad, why isn't there a recall?? This is a "top of the line SUV" and yet it needs $4500.00+ in engine repairs at just over 113K miles. Infiniti needs to step up and take responsibility for this issue. If dealerships are warning you about this issue, obviously there is a KNOWN issue.

Filed Jun 15, 2021 · Engine · MS

My 2012 Infiniti QX56 has a loud rattling noise coming from the engine. This started around Oct 2020 and comes and go. It has got worse over the last month or so and has started stalling and acting like it doesn't want to go. A few times the car will start shaking while I'm driving. It has been checked out and codes for converter and timing chain are there. Engine light is on. I drive this car with my 2 children and am afraid of the safety issue. I know there is numerous others having these same 2 issues with my year and make of car. Spoke with Infiniti Corp. and they will not do anything about it because my VIN is not under the recall. However, the vehicles with this issue that have been repaired under the recall have the same engine and same issues that I'm having. I think all vehicles in 2012 regardless of VIN should be under the recall as I'm seeing so many with these issues.

Filed Jul 29, 2019 · Engine, Fuel system · TX

I had my catalytic converter replaced back in december 2016 . There was a recall for catalytic converter so I had it replaced. Now the check engine light is back on so I got it checked out and was told that I needed to replace the catalytic converter again. 35k miles later

Filed Apr 22, 2019 · Electrical, Engine · 115,540 miles · NC

Was driving home, A/C was on, all lights was on, all of a suddenly lost of power to the engine and while going up hill, so I floor it so the vehicle so I can get past over the hill then I started to smell something through the vents like it was on fire coming from the engine bay so I pulled over and turned off the engine pop the hood but didn't see no fire, then when I tried to start the vehicle back up it wouldn't so I waited for few minutes and tried again, the vehicle started back up so I went on driving again but it didn't show any thing on the dash no check engine light at all. It done it again lose of power to the engine and I started smelling something burning like metal coming from the vents again lucky I was close to home when it done it again, I shut the vehicle off and put the scanner on it, it throw out 3 codes but it never showed up on the dash saying check engine light at all. For the 3 codes one was for fuel pump other was for 02 sensor and the other was ECM I believe, wish I wrote them all down.

Filed Feb 13, 2019 · Engine · 95,000 miles · IL

Engine light came on dealer states that I need new catalytic converter on my front driver side.

Filed Jan 30, 2019 · LA

I own a qx56 and I brought it to the dealership because the check engine light was on I was told both of my catalytic converters have gone out. I purchased the extended warranty but the say it is not covered under my warranty. Doing a lil research on it I see plenty of people are having the same problem. This part should be recalled or at least covered under warranty. Love my truck but definitely not happy right now. Infiniti needs to do something about this situation.

Filed Dec 22, 2018 · Fuel system · 105,000 miles · NY

The fuel rail pressure center malfunction is not working. Car stalls when driving - check engine light is on

Filed Sep 27, 2018 · Engine · 82,000 miles · TX

At 82,000 miles the check engine light came on indicating both catalytic converters were bad. They are warrantied to 80k miles and of course manufacturer would not help. This needs a recall, google qx56 catalytic converter and see how many people have had this issue.

Filed Nov 8, 2016 · Electrical, Engine · 70,000 miles · CO

We have had problems with the battery since we bought the qx56. Suv's completely dies after a glove box light, radio has been played for 20 to 30 minutes, car cannot be jumped by typical cables, every time we either had to have a heavy duty jump done by tow company or battery was replaced by infiniti. Timing chain and both catalytic converters need to be replaced, with engine issues. Infiniti had SUV for almost a month to fix engine and timing chain. Engine light still coming on then we where told the converters needed to be replaced. $5k to fix. It sounds like this is a very common issue with qx56 for this year and others. After each time engine light came on infiniti service dept told us to continue driving the car and after 2 weeks if it didn't reset then call back again. We did this reluctantly, because I am my wife have been taught that when you have an engine light come on, stop call, and get the vehicle in to be inspected.