Service bulletin ITB19-040

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10168892
Published by NHTSA	2019-12-06
Manufacturer's number	ITB19-040
Manufacturer's date	2019-11-22
NHTSA component	POWER TRAIN

NHTSA's summary

2014-2015 Q50; MIL ON WITH DTC P0720 AND MAY HAVE HARSH SHIFTING AND/OR LACK OF POWER SERVICE INFORMATION If DTC P0720 OUTPUT SPEED SENSOR is stored, follow the diagnostic procedure in the ESM. If the diagnosis leads to output speed sensor replacement, replace the control valve. Do NOT replace the output speed sensor. • - Refer to the ESM for control valve replacement: TRANSMISSION DRIVELINE> TRANSAXLE TRANSMISSION > 7 AT: RE7R01A > REMOVAL AND INSTALLATION > CONTROL VALVE TCM. HINT: The vehicle may also have harsh shifting and/or lack of power.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Transmission and driveline

Trouble codes named

P0720

Vehicles listed
INFINITI Q50	2014, 2015

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
2024362	2024-06-21. Powertrain
24V470000	2024-06-21. POWER TRAIN:DRIVELINE:DRIVESHAFT
2014416	2014-09-24. Powertrain
2014415	2014-09-23. Powertrain
2014414	2014-09-23. Powertrain
14V582000	2014-09-22. POWER TRAIN:AUTOMATIC TRANSMISSION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
ITB15027	2021-05-10. Service bulletin. SERVICE INFORMATION If the glove box is removed for any reason (for example, installing an accessory kick plate, replacing an in-cabin microfilter, etc.), verify the trunk release power cancel switch operates normally after installing the glove box. See this bulletin for further detail.
ITB11011A	2021-05-10. Service bulletin. SERVICE INFORMATION For QX60 Hybrid Vehicles, go to page 4. Q50, Q70, and M35 Hybrid Vehicles The internal combustion (IC) engine in the Q50, Q70, and M35 Hybrid vehicles is started using a high voltage motor that is integrated into the transmission. The high voltage motor gets its power from the high voltage Lithium-Ion (Li-ion) battery that is mounted between the trunk room and the rear seat. The Li-ion battery cannot be recharged using an external battery charger; therefore it is very important that the battery state of charge (SOC) is properly maintained during extended storage periods. Action must to be taken in order to prevent excessive discharge of the high voltage Li-ion battery during an extended storage period. If the reserve capacity of the Li-ion battery is not sufficient, the hybrid system cannot be started. Perform the Battery Discharge Prevention During Extended Storage procedure in this bulletin once a month (every 30 days). NOTE: A discharged high voltage Li-ion battery is not a warrantable issue. See this bulletin for further detail.
ITB14028A	2021-05-10. Service bulletin. SERVICE 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.
ITB14051A	2021-05-10. Service bulletin. IF YOU CONFIRM All of the following: The FCW (Forward Collision Warning) malfunction is ON or reported to have been ON, and DTC C1A27 (ECD POWER SUPPLY CIRCUIT) is stored (Past or Current), and the brake fluid level is normal. NOTE: C1A27 is an ICC (Intelligent Cruise Control) DTC. ACTION Reprogram the ABS control unit (ABS) per the Service Procedure in this bulletin. - Part of the Service Procedure, step 20 on page 8, is a confirmation that reprogramming is needed to resolve the incident shown in Figure A and B on page 1. See this bulletin for further detail.
ITB15007	2021-05-10. Service bulletin. IF YOU CONFIRM A power window auto-up does not work for one or more power windows. ACTION Replace the left front (driver) door finisher with the new one listed in the Parts Information. While replacing the door finisher, also replace the main power window switch. See this bulletin for further detail.
ITB14055	2021-05-10. Service bulletin. SERVICE INFORMATION If a customer describes lack of power or poor acceleration, perform the following checks before attempting any repair: * Check for stored DTCs. * Check if the driver is resting their left foot on the brake pedal while accelerating. Advise the customer not to rest their foot on the brake while accelerating. * Use CONSULT-III plus in Engine Data Monitor to check operation of the brake lamp circuit signal. Monitor the brake switch during the incident; it should be "OFF". Please see this bulletn for further details.
ITB14029	2021-05-10. Service bulletin. IF YOU CONFIRM Using chassis ear, a rattle noise coming from the rear propeller shaft center bearing under the following conditions - Light to moderate acceleration, and between 2,000 and 2,800 rpm. ACTION Replace the rear propeller shaft with the new one (new style) listed in the Parts Information of this bulletin. See this bulletin for further detail.
ITB14014	2021-05-10. Service bulletin. SERVICE INFORMATION When diagnosing an applied vehicle for possible power steering gear (rack and pinion steering rack, or steering rack) leak issues, in some cases it may appear the steering rack is leaking when actually, it?s not. Use this service bulletin to help make a more accurate diagnosis of the steering rack. - Go to Power Steering Gear Inspection starting on page 2. See this bulletin for further detail.
ITB13033A	2021-05-10. Service bulletin. SERVICE INFORMATION: At engine start up, if a low 12 volt battery condition (approximately 8 volts) occurs with an Applied Vehicle, the following conditions may happen: * The Power Steering Warning Light is, or may have been ON. * DTC codes C13EB (DAST1, DAST2) and C13E9 (DAST1) may be stored as current or past. * Power steering will go to EPS mode (reduced power assist). Additionally, * The steering wheel may be off-center when starting to drive. Please see this bulletin for futher details.
ITB18-034	2018-12-03. Service bulletin. TRANSMISSION & ENGINE AUTOMATED DATA COLLECTION AND DIAGNOSTIC REPORTING SERVICE INFORMATION To support proper diagnosis and to promote Fixed-Right-First-Time ? Infiniti may review CONSULT-III plus (CIII plus) data relating to vehicle operation and function to help with vehicle diagnosis and diagnostic validation. IMPORTANT: For transmission/engine repair or replacement, retailers are required to connect C-III plus and perform ?Diagnosis (All Systems)?. Performing C-III plus ?Diagnosis (All Systems)? is also required prior to contacting any Infiniti call center (i.e. TECH-LINE, PCC, or WCC) for diagnostic support or claim preauthorization. NOTE: For additional information regarding Automated Vehicle Data Collection, refer to IWBI/18-019. To support Automated Vehicle Data Collection, your C-III plus must have the Diagnosis result reporting function-Setting turned ON. If Diagnosis result reporting function-Setting is OFF: - It may cause dealer consideration for Audit or the Anomalous Repair Control (ARC) program, where applicable. - It may result in a repair being non-warrantable. Refer to the Service Procedure on the next page to confirm your C-III plus ?Diagnosis result reporting function-Setting? is turned ON.