2015 Infiniti Q40

Owner complaints

What owners report most

1. Air bags3
2. Unknown or other3
3. Electrical system1
4. Electronic stability control (esc)1
5. Exterior lighting1
6. Structure1

Latest complaints

• Apr 13, 2025NJ
  Electrical system · Exterior lighting

  A common issue found in the Infiniti Q40/G37 lineage, the sunroof drain became clogged leading to an influx of moisture underneath the flooring and within the panels of the right half of the vehicle. Due to the fault, electrical components such as the BCM and ECM were exposed to moisture, leading to numerous issues.

• Aug 21, 2024NC100,328 mi
  Structure
  The contact owns a 2015 Infiniti Q40. The contact stated while parked, a water leak coming from the driver’s side floor was discovered. The contact also noticed that there was an abnormal odor coming from inside the vehicle that became more pronounced with the A/C unit activated. The vehicle was…

  The contact owns a 2015 Infiniti Q40. The contact stated while parked, a water leak coming from the driver’s side floor was discovered. The contact also noticed that there was an abnormal odor coming from inside the vehicle that became more pronounced with the A/C unit activated. The vehicle was taken to a dealer; however, a diagnostic test was pending. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 100,328.

• May 20, 2020WA25,000 mi
  Unknown or other

  The car when parked on a steep slope with the emergency brake/parking brake on will start to roll on its own. infiniti was contacted and blamed my driveway as the problem but I have 6 cars and the infiniti IS the only car that cant stay parked and rolls when parked. Was told ID have to pay 3 thousand dollars if I wanted my car to get checked. *tr

• Sep 27, 2019TX60,000 mi
  Air bags

  Since I bought car the passenger "air bag off" light IS always on whenever my wife, who weighs 165 lbs, IS a passenger - she does not have airbag protection. we normally do not have a passenger in the front seat, and never even knew if that was an option until my wife just sat in the passenger seat and pointed it out to me. this IS while she was sitting with the seat belt while the car was moving at any speed.

• Jul 29, 2019TX52,000 miCrash
  Electronic stability control (esc) · Unknown or other

  While in motion on a highway the vdc (auto hydroplane correct function) IS suspected to have caused increase loss of control of vehicle. I was able to observe that the vdc light was flickering on and off. It did initially come on to auto correct but then abruptly the vehicle started to hydroplane, despite the function being on and caused me to have to divert into a guardrail...

• Jun 22, 2017CA18,000 mi
  Air bags

  The passenger airbag off light stays on while an adult weights more than 120 pound sitting on the passenger seat. The light won't go off while the car IS moving.

• Dec 29, 2015CA3,000 mi1 injury
  Unknown or other
  I bought this new 2015 infiniti Q40 AWD from infiniti dealer on feb 28, 2015. After driving this noisy car for three months(3000miles), I started having ringing in both ears (tinnitus). I have trouble to sleep and start losing my hearing in both ears. I have contacted the infiniti dealer in june…

  I bought this new 2015 infiniti Q40 AWD from infiniti dealer on feb 28, 2015. After driving this noisy car for three months(3000miles), I started having ringing in both ears (tinnitus). I have trouble to sleep and start losing my hearing in both ears. I have contacted the infiniti dealer in june 2015, the first time I noticed the tinnitus caused by the low frequency noise( range from 100-400hz according to the analysis from adobe audition cc software). The noise became noticeable when reach 35 mph on both local and highway road. They refused to take the car back to investigate the problem and claimed that it's normal car noise. I took my doctor's suggestion to wear earplugs when driving this Q40 since then. After another 6 months of driving (total mileage IS 11,000miles now), the tinnitus and my hearing didn't get better. I contacted the car maker again in dec 2015. After a second road test, infiniti still claims it's the normal noise. They refused to give me full refund with the compensation to the health damage on me. With no concern on the fact that this noise already caused severe and permanent health damage to the customer, infiniti refused to recall the cars and investigate the potential harm of the low frequency noise to the customers. 8574 of infiniti Q40 were sold in u.s. Since jan 2015 ( infiniti sales stats: http://www.goodcarbadcar.net/2011/01/infiniti-g-sales-figures.html). all these customers may suffer from the same noise. Some of them may have family members riding with them, including children. The public should be alerted that there IS potential risk to drive this car, for both the current Q40 owners and the potential buyers.

• Sep 6, 2015TX120 mi
  Air bags
  Since I bought car at 96 miles and now at 3000 miles the passenger "air bag off" light IS always on whenever my wife, who weighs 105 to 109 lbs, IS a passenger - she does not have airbag protection. I took car to the service department of two independent dealerships 4 months apart..they both kept…

  Since I bought car at 96 miles and now at 3000 miles the passenger "air bag off" light IS always on whenever my wife, who weighs 105 to 109 lbs, IS a passenger - she does not have airbag protection. I took car to the service department of two independent dealerships 4 months apart..they both kept it overnight, tested it "thoroughly." their respective service managers said that the air bag met all specifications and that they "cannot adjust since it IS set at the factory" I was referred to infiniti regional office and their representative said the same thing, but he added that given her weight if the air bag did deploy it would "be like a lethal weapon." I just read about the nissan "bag light recall" in today's paper. I am very uneasy...updated 10/01/15*bf

Service bulletins

Technical service bulletins and other communications the manufacturer sent dealers about this vehicle. Ask a dealer for the full document by its number.

• 11002539INTELLIGENT KEY NOT DETECTED / ENGINE WILL NOT START This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 11002537CAN COMMUNICATION NETWORK DIAGNOSTIC FLOW CHART This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 11001653CAN COMMUNICATION CODES DIAGNOSTIC TIPS AND GUIDELINES This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 11001182WINDOW GLASS WARRANTY INFORMATION This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 11001179REMOVING FOREIGN MATERIAL FROM THE WINDOW GLASS This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 11001177WINDSHIELD CRACKING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10235451HEADLAMP, FOG LAMP, OR REAR COMBINATION LAMP FOGGING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10233614CLICKING NOISE FROM FRONT OR REAR AXLE DURING TAKE-OFF/ACCELERATION This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10233611ABS/VDC CAN DIAGNOSIS INFORMATION This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10232646REMOVING FOREIGN MATERIAL FROM THE WINDOW GLASS This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10232645WHEEL BEARING COLLISION DAMAGE This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10232644WINDSHIELD CRACKING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10222705CLICKING NOISE FROM FRONT OR REAR AXLE DURING TAKE-OFF/ACCELERATION This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10208943BATTERY QUICK CHARGE NOTICE SERVICE INFORMATION When charging the vehicles 12 volt battery with the high amperage quick charge function, the ignition should never be ON, or turned ON, while charging. Attempting to start the vehicle, or turning the ignition ON, while using the high amperage quick charge could potentially damage the fuel pump control module. Only turn the ignition ON when either the ESM or a technical service bulletin service procedure states to do so, and only while using a battery maintainer or smart charger set to reflash mode, or a similar setting. Battery voltage should not exceed 16V during a reprograming operation.
• 10208936DTC P0456 CAUSED BY EVAP LEAK AT VENT CONTROL VALVE O-RING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10208932EVAP LEAK DTC P0442, P0455, P0456 INFORMATION This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10208930CAN COMMUNICATION NETWORK DIAGNOSTIC FLOW CHART This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10207844CAN COMMUNICATION CODES DIAGNOSTIC TIPS AND GUIDELINES This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10206354HEADLAMP, FOG LAMP, OR REAR COMBINATION LAMP FOGGING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10206343CLEANING FRONT OR REAR COMBINATION LAMP ASSEMBLIES This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10206332HEADLAMP, FOG LAMP, OR REAR COMBINATION LAMP FOGGING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10199137CLICKING NOISE FROM FRONT OR REAR AXLE DURING TAKE-OFF/ACCELERATION This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
• 10192842SERVICE INFORMATION Temporary tire Flat Spotting is common on New Dealer In-Stock vehicles that have not been occasionally moved. Flat Spotting can occur after the vehicle has been parked (not moved) for a few days, or longer. In most cases it is temporary. In extreme cases it can be permanent. Vehicles should be moved every 30 days, in one direction only, enough to rotate the tires 90 (see Figure 1). Moving vehicles as shown in this bulletin will prevent tire Flat Spotting. See this bulletin for further detail.
• 10192806IF YOU CONFIRM A refrigerant leak at a refrigerant pipe/hose joint location, ACTIONS 1. Inspect the metal surfaces of the pipe/hose joint for damage or contamination. NOTE: Do not replace a refrigerant pipe, hose, or other A/C component if an o-ring seal will solve the leak incident, if it should occur. 2. If no damage is found to the joint metal surfaces, replace the O-ring seal. See this bulletin for further detail.
• 10192751SERVICE INFORMATION Occasionally customers may notice water vapor or fog in the headlamps. The information, illustrations, and flow chart in this bulletin are provided to help you in determining if an incident for water/condensation in the headlamps is normal or not. Infiniti?s new vehicle limited warranty does not cover physically damaged (cracked or broken) headlamps. All current headlamp assemblies are vented to the atmosphere (not sealed). - This is necessary to allow for expansion and contraction of air from temperature "variations" (warmer or colder) without damage to the headlamp. - Moisture in the air sometimes "travels" into and out of the headlamp assembly through these vents. - Certain environmental conditions may cause moisture to condense. - The fogging/cloudiness should disappear over time when the headlamp is in a dry environment. See this bulletin for further detail.
• 10192745IF YOU CONFIRM The MIL is "ON" with DTC P0603 (ECM BACK UP/CIRCUIT). ACTION 1. Confirm that the battery voltage is 11 volts, or more, with the ignition ON (engine OFF, not running). 2. Erase DTC 3. Perform DTC confirmation steps in the Service Procedure. 4. Confirm 1st trip DTC P0603 is not stored. NOTE: P0603 is often the result of low battery voltage, discharged battery or battery terminal disconnections. Please see this bulletin for furtner details.
• 10192728SERVICE INFORMATION The purpose of this bulletin is to give Infiniti dealers guidelines to help determine if windshield breakage is covered under warranty or is the customer?s responsibility. Nissan North America (NNA) is not responsible for damage to glass that is a result of objects striking or scratching the glass. However, NNA is responsible for manufacturing issues such as distorted glass and cracks that are due to improper installation or damage to the glass during vehicle assembly. NNA typically does not find any type of cracks in the windshield due to stress after the dealership PDI. See this bulletin for further detail.
• 10192693SERVICE INFORMATION Windshield "foreign material" that is on the surface of the glass in some cases can be cleaned off with a very particular type and grade of steel wool. * Most any foreign material on the surface of the Windshield can be cleaned off by using #0000 super fine steel wool. >The #0000 grade super fine steel wool can be found in most hardware stores. Please see this bulleitn for further details.
• 10192673SERVICE INFORMATION Design and process changes have been made to improve battery voltage at dealer receipt. Our goal is to deliver vehicles to customers with a 12 volt battery in excellent condition. Proper dealership storage and maintenance of vehicle 12 volt batteries is essential to insuring good battery operating life and customer satisfaction. Dealers are responsible for maintaining vehicles in their inventory. 12 volt batteries in vehicle inventory should always be kept at a full charge to prevent excessive discharge during storage and so they are ready for delivery to customers at any time. See this bulletin for further detail.
• 10192667Infiniti is conducting a Voluntary Service Campaign on ~13,807 MY15 Q40 Sedan and Q60 Coupe vehicles to provide a revised Owner's Manual.
• 10192660Infiniti is conducting a Voluntary Service Campaign on ~13,807 MY15 Q40 Sedan and Q60 Coupe vehicles to provide a revised Owner's Manual.
• 10192647IF YOU CONFIRM The customer states HomeLink will not operate or has improper operation. ACTIONS 1. To significantly reduce unnecessary repairs, make sure: a. The vehicle is not in "Transit Mode" (if equipped). - Not in Transit Mode: With the turn signal switch is in the OFF (center) position, turn the ignition from OFF to ON. If the turn signal indicators stay OFF (do not illuminate), the vehicle is not in Transit Mode. b. The "Extended Storage Switch" (if equipped) is in the "Customer Delivery" position (pushed in). - The Extended Storage Switch is located on the fuse block that is located in the interior of the vehicle. 2. Confirm the customer is familiar with the HomeLink programming procedure located in the vehicle?s owner?s manual. 3. Test HomeLink operation with special tool HomeLink Transmitter Tester J-41540. See this bulletin for further detail.
• 10192639SERVICE INFORMATION This bulletin has compiled Tire Pressure Monitor System (TPMS) and Low Tire Pressure Warning System (LTPWS) information for: - Basic diagnosing of TPMS/LTPWS systems - Radio frequency interference causing a "No Data" (C1708, C1709, C1710, C1711) condition - Sensor leaks - Moving TPMS/LTPWS wheel assemblies from one vehicle to another and TPMS/LTPWS sensor registration - Air pressure changes with altitude and ambient temperatures - Aftermarket tire sealers - Aftermarket wheels - Inflating/deflating tires with TPMS/LTPWS sensors See this bulletin for further detail.
• 10192616SERVICE INFORMATION The information in this bulletin is provided to help ensure correct diagnosis and repair of fluid leaks. All fluid leaks, when properly diagnosed, should be repaired (whether under warranty or customer pay) to ensure proper vehicle operation. However, certain normal operating conditions can be misdiagnosed as a leak requiring repair. Unnecessary repair or replacement of parts in connection with incorrectly diagnosed "leaks" can negatively impact customer satisfaction, be time consuming and costly, and if not performed correctly can lead to future repairs. See this bulletin for further detail.
• 10192613SERVICE INFORMATION If the AV Control Unit needs to be replaced on an Applied Vehicle for any reason, follow the steps in the Service Procedure to configure the Multi AV system. NOTE - The original AV Control Unit must be installed in the vehicle while performing part of this procedure. DO NOT remove the original AV Control Unit until instructed. See this bulletin for further detail.
• 10192609IF YOU CONFIRM: The MIL is ON with DTC P0101 and/or P010B (MAF SEN/CIRCUIT-B1/B2) and there are no drivability issues. ACTION: 1. Refer to step 6 in the SERVICE PROCEDURE to confirm this bulletin applies to the vehicle you are working on. 2. If this bulletin applies, reprogram the ECM. NOTE: If this bulletin does apply (the ECM needs to be reprogrammed), do NOT replace the mass air flow sensor(s). See this bulletin for further detail.
• 10192598SERVICE INFORMATION When servicing run flat tires or low profile tires: - Special equipment and procedures are required to avoid damage. - Specifically, Tire Pressure Monitor transmitters (TPMS sensors) can be damaged when improperly dismounting and mounting tires. - TPMS sensors becoming damaged during mounting or dismounting tires are not covered under warranty. - To avoid such damage, ensure that the tire changer being used and the operator of the tire changer are capable of servicing run flat and low profile tires. - Operator?s manuals for such tire changers must be followed. See this bulletin for further detail.
• 10192589SERVICE INFORMATION After ECM reprogramming, the Calibration Verification Number (CVN) needs to be automatically calculated prior to State emissions testing (also known as Inspection Maintainence, I/M, or SMOG testing depending upon location). Allowing the vehicle to idle for 22 minutes will allow for faster CVN calculation. It is recommended that customers utilize this method if the vehicle needs to be tested for emissions soon after ECM reprogramming. See this bulletin for further detail.
• 10192569SERVICE INFORMATION The Body Control Module (BCM) for the Applied Vehicles in this bulletin is now shipped as a blank unit. As with previous BCM replacements, when a blank unit is installed, the configuration process must be performed. See this bulletin for further detail.
• 10192560SERVICE INFORMATION If you confirm there is a need to replace the combination meter front cover (lens) on an Applied Vehicle for any reason (scratch, blemish, etc.): - Do not replace the entire combination meter assemby. The front cover of the combination meter assembly is available as a separate service part. - Refer to the Electronic Service Manual, section MWI-Meter, Warning Lamp & Indicator, for replacement information. See this bulletin for further detail.

Every Infiniti Q40 model year

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