Service bulletin ITB16-008C

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	10191925
Published by NHTSA	2021-05-07
Manufacturer's number	ITB16-008C
Manufacturer's date	2021-04-01
NHTSA component	ENGINE AND ENGINE COOLING

NHTSA's summary

MIL ON WITH P0603 STORED FOR ECM BACK UP CIRCUIT This bulletin has been amended. See AMENDMENT HISTORY on page 3. Please discard previous versions of this bulletin.

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

Engine

Trouble codes named

P0603

Vehicles listed
INFINITI Q50	2015
INFINITI Q60	2015
INFINITI Q70	2015, 2016, 2017, 2018, 2019
INFINITI QX50	2015, 2016, 2017
INFINITI QX60	2015
INFINITI QX70	2015, 2016, 2017

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

Recalls for the same vehicles and component
21V774000	2021-10-04. HYBRID PROPULSION SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
14V583000	2014-09-22. VEHICLE SPEED CONTROL:ACCELERATOR PEDAL; ENGINE AND ENGINE COOLING:ENGINE

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
ITB17-042E	2022-03-12. Service bulletin. DTC 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.
ITB13-044J	2022-03-12. Service bulletin. EVAP 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.
ITB14-011F	2022-02-10. Service bulletin. REMOTE ENGINE START NOT WORKING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
ITB13026E	2021-05-10. Service bulletin. SERVICE INFORMATION If the Display Control Unit (DCU) needs to be replaced on an Applied Vehicle for any reason, follow the steps in the Service Procedure of this bulletin. See this bulletin for further detail.
ITB16014	2021-05-10. Service bulletin. IF YOU CONFIRM The MIL is ON with P0116 Engine Coolant Temperature (ECT SENSOR) stored, and There are no drivability issues. ACTION 1. Refer to step 6 in the SERVICE PROCEDURE to confirm if ECM reprogramming applies. 2. If it applies, reprogram the ECM. See this bulletin for further detail.
ITB16013	2021-05-10. Service bulletin. IF YOU CONFIRM The MIL is ON with P0116 Engine Coolant Temperature (ECT SENSOR) stored, and There are no drivability issues. ACTION 1. Refer to step 6 in the SERVICE PROCEDURE to confirm if ECM reprogramming applies. 2. If it applies, reprogram the ECM. See this bulletin for further detail.
P5320	2021-05-10. Service bulletin. Infiniti is conducting a retailer inventory service action to replace the Concentric Slave Cylinder (CSC) Tube on 26 specific MY 2015-16 Q60 Coupe vehicles identified in Service Comm due to a potentially out of specification O-ring.
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.
ITB13054D	2021-05-10. Service bulletin. IF 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.
ITB15024	2021-05-10. Service bulletin. SERVICE 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.