2023 Isuzu N Series TSBs

STORED IN THE ELECTRONIC HYDRAULIC CONTROL UNIT (EHCU) AS A HISTORY CODE. WHEN AN IDLE SHUTDOWN EVENT OCCURS, COMMUNICATION BETWEEN THE TCM AND THE EHCU IS TEMPORARILY SUSPENDED. THIS CAN CAUSE DTC U0101 (00) TO SET IN THE EHCU ALTHOUGH THERE IS NO FAULT IN THE SYSTEM.

MAKE AVAILABLE A WORKSHEET TO ASSIST THE TECHNICIAN IN DETERMINING IF OIL CONSUMPTION IS EXCESSIVE. OIL USAGE HAS A DIRECT RELATIONSHIP WITH THE AMOUNT OF FUEL USED. THE HARDER AN ENGINE WORKS, THE MORE FUEL AND OIL IT WILL USE. THEREFORE, OIL USAGE AS A FACTOR OF FUEL USAGE IS A MORE ACCURATE INDICATOR OF ACCEPTABLE OIL CONSUMPTION. THE ACCEPTED RATE OF OIL CONSUMPTION FOR THE AFFECTED VEHICLES IN THIS BULLETIN IS 0.946 LITER (1 QT) WITHIN 379 LITERS (100 GALLONS) OF FUEL USED. THIS RATE ONLY APPLIES TO VEHICLES UNDER WARRANTY, MAINTAINED IN ACCORDANCE WITH THE APPROPRIATE MAINTENANCE SCHEDULE, DRIVEN AT LEGAL SPEEDS AND WITHIN DESIGN INTENT OF THE VEHICLE. MANY FACTORS CAN AFFECT AN OWNER'S CONCERN WITH OIL CONSUMPTION. DRIVING HABITS AND VEHICLE MAINTENANCE VARY FROM OWNER TO OWNER. THOROUGHLY EVALUATE EACH CASE BEFORE DECIDING WHETHER THE VEHICLE IN QUESTION HAS ABNORMAL ENGINE OIL CONSUMPTION.

OUTLINED IN THE FUEL SECTION OF THEIR VEHICLES OWNERS MANUAL. RUNNING AN ENGINE WITH GASOLINE CONTAMINATION MAY LEAD TO DAMAGE TO THE FUEL SYSTEM AND/OR CATASTROPHIC ENGINE DAMAGE. PROTECT YOUR CUSTOMERS ENGINE FROM CONTAMINATED GASOLINE BY RECOMMENDING REGULAR FUEL SYSTEM INSPECTION AND MAINTENANCE.

AFFECTED VEHICLES LISTED ABOVE, TO BE REPLACED UNDER THE ISUZU NEW VEHICLE WARRANTY, GOODWILL, ISUZU PARTS WARRANTY, GOLD STAR USED TRUCK WARRANTY AND/OR ALL EXTENDED POWERTRAIN WARRANTIES OFFERED BY ISUZU, AS WELL AS ALL OVER-THE-COUNTER ENGINE AND TRANSMISSION ASSEMBLY REPLACEMENTS.

5.2L (4HK1) DIESEL ENGINES AND OPTION (IE1) 4-WHEEL DISC BRAKES WERE BUILT WITH AN ENGINE CONTROL MODULE (ECM) AND DIESEL EXHAUST FLUID CONTROL UNIT (DCU) CONTAINING AN ON BOARD DIAGNOSTIC (OBD) CALIBRATION ERROR FOR DIAGNOSTIC TROUBLE CODES (DTC) P2201 NOX SENSOR CIRCUIT PERFORMANCE SENSOR 1 AND P20EE DIESEL EXHAUST FLUID (DEF) SYSTEM NOX TRAP LOW EFFICIENCY.

antilock brake, instrument panel, body control, power interface, etc.) reprogramming. Control module calibrations are regularly updated for many reasons. These reasons may include, but are not limited to: model year change, software corrections, certification compliance, product improvement and specific application requirements. However, the mere existence of a newer control module calibration does not necessarily mean that warranty coverage exists or that the calibration must be installed. It is not our policy to update control modules, under warranty or after warranty, based solely on the availability of a newer calibration file. Below are our guidelines for reprogramming control modules.

N-Series vehicles produced from 8/26/2020 through 7/31/2022 and equipped with 6.6L (L8T) gasoline engines may experience water intrusion into the Mass Air Flow (MAF) sensor connector. If water intrudes into this connection, you may experience engine performance issues as well as setting the Check Engine Malfunction Indicator Lamp (MIL). CORRECTION Dealers will replace the MAF sensor and apply additional sealing tape to the MAF connection for waterproof protection on affected vehicles. This service will be provided free of charge.

converters welded in place instead of the OEM catalytic converter. This is because vehicle owners who have had the OEM or Fleet Value catalytic converters stolen from their vehicles often replace the stolen catalytic converters aftermarket with non-Isuzu parts. When those replacement parts fail and cause the check engine light to illuminate, vehicle owners may seek to have the non-Isuzu replacement catalytic converter repaired or replaced under warranty. In fact, however, neither the new vehicle warranty nor the one-year replacement part warranty covers the failed non-Isuzu part.

provides quick and easy-to-understand repair solutions 2) DPF Early Regeneration Warning: IDA also reviews the three latest DPF regeneration odometer readings in the Health Report of the applicable VIN on IDA. IDA then analyzes the distances between the three regenerations. If the average of these distances is less than 55 km for a 4HK1 (5.2L) engine, or less than 70 km for a 4JJ1 (3.0L) engine, an alert will be shown on the IDA page in the form of a red regeneration icon. This is an early warning indication that a problem may be forming in the DPF regeneration cycle. However, if the enabling criteria shown above are not met, a regeneration icon will not appear on the IDA for that particular VIN. Detailed instructions on how to use IDA are included in this bulletin.

Isuzu N-Series Diesel Vehicles produced after 7/26/2021 with RPO Code EM2 or EL5 (200" or 212" respectively) Wheelbase Factory Modifications. When the subject vehicles were modified to extend the frame, the Anti-lock Brake System (ABS) module was not recalibrated to account for the different inputs from the vehicle resulting from the stretched frame. Therefore, when driving in a curve, the Electronic Stability Control (ESC) system, working together with the ABS, may react prematurely or be delayed in reacting, therefore increasing the risk of a crash. If the vehicle is equipped with the optional Advanced Driver Assistance System (ADAS), the ADAS camera was also not recalibrated to account for the different inputs from the vehicle resulting from the stretched frame. Therefore, when driving in a curve with the optional ADAS system activated, the Automatic Emergency Braking System (AEBS) and its accompanying warning light may be delayed in reacting and illuminating, also increasing the risk of a crash.

Isuzu N-Series Diesel Vehicles produced after 7/26/2021 with RPO Code EM2 or EL5 (200" or 212" respectively) Wheelbase Factory Modifications. When the subject vehicles were modified to extend the frame, the Anti-lock Brake System (ABS) module was not recalibrated to account for the different inputs from the vehicle resulting from the stretched frame. Therefore, when driving in a curve, the Electronic Stability Control (ESC) system, working together with the ABS, may react prematurely or be delayed in reacting, therefore increasing the risk of a crash. If the vehicle is equipped with the optional Advanced Driver Assistance System (ADAS), the ADAS camera was also not recalibrated to account for the different inputs from the vehicle resulting from the stretched frame. Therefore, when driving in a curve with the optional ADAS system activated, the Automatic Emergency Braking System (AEBS) and its accompanying warning light may be delayed in reacting and illuminating, also increasing the risk of a crash.

walls, pistons, and piston rings. When a piston moves down its cylinder, a thin film of oil is left on the cylinder wall. During the combustion process, part of this oil layer is consumed. As a result, varying rates of oil consumption are accepted as normal in all engines. The purpose of this bulletin is to describe different instances where oil consumption occurs and to make available a worksheet to assist the technician in determining if oil consumption is excessive.

the 2023MY Isuzu N-Series Vehicles equipped with 6.6L Gasoline Engine.

FIGURE 1 BELOW IS AN EXAMPLE OF THE CAMERA USED ON A MOBILEYE 6 SYSTEM. THE PROCEDURE DISCUSSED IN THIS BULLETIN MUST BE USED FOR REPAIRING ANY MOBILEYE 6 SYSTEM.

is distributing this procedure for adding keyless entry transmitters as a quick reference to help dealers better service the customer. Also included is the clearing procedure for customers who have had transmitters lost or stolen. This procedure may be used to clear all transmitters from the Keyless Entry Control Unit.

is distributing this procedure for adding keyless entry transmitters as a quick reference to help dealers better service customer. Also included is the clearing procedure for customers who have had transmitters lost or stolen. This procedure may be used to clear all transmitters from the Keyless Entry Control Unit.

(ICTA) is providing the following procedural recommendations to improve dealer efficiency when submitting Parts Warranty claims. We strongly recommend dealers follow these procedures in order to avoid delays in Parts Warranty claim payments and/or claim chargeback. This bulletin was revised to add a Parts Warranty Form

(ICTA) is providing the following procedural recommendations to improve dealer efficiency when submitting Parts Warranty claims. We strongly recommend dealers follow these procedures in order to avoid delays in Parts Warranty claim payments and/or claim chargeback.

Isuzu dealer technicians repairing Isuzu vehicles in and out of vehicle warranty. A TAC case number will be issued solely for information tracking purposes and future contact reference.

BATTERIES AND ALTERNATORS IN THE AFFECTED ISUZU VEHICLES. IT IS IMPORTANT TO CONFIRM THE BATTERY IS IN GOOD CONDITION PRIOR TO DIAGNOSIS OF THE ALTERNATOR AND CHARGING SYSTEM. NEVER REPLACE AN ALTERNATOR BEFORE TESTING THE BATTERYS CONDITION.

BATTERIES AND ALTERNATORS IN THE AFFECTED ISUZU VEHICLES. IT IS IMPORTANT TO CONFIRM THE BATTERY IS IN GOOD CONDITION PRIOR TO DIAGNOSIS OF THE ALTERNATOR AND CHARGING SYSTEM. NEVER REPLACE AN ALTERNATOR BEFORE TESTING THE BATTERYS CONDITION. BATTERIES MUST BE FULLY CHARGED FOR THE ECM AND/OR STARTER RELAY TO FULLY ENGAGE WITH THE STARTER. IF THE BATTERY VOLTAGE IS LOW, THE ECM WILL NOT ENGAGE OR MAY PARTIALLY ENGAGE THE STARTER. REPLACE THE ALTERNATOR ONLY IF IT FAILS THE ON VEHICLE TESTING PROCEDURE.

Exhaust Fluid (DEF) System NOx Trap Low Efficiency set without an apparent cause. New calibrations for the DEF Control Unit (DCU) have been developed to address this concern. Follow the diagnostic for this DTC. If no fault can be found when performing the normal diagnosis, follow the service procedure in this bulletin to reprogram the DEF Control Module.

the importance of performing the relearn procedure after replacing the sensor or other steering related components that could cause the sensor angle to change. This sensor's position is initially learned by the Electric Hydraulic Control Unit (EHCU) during initial factory installation. The relearn procedure is done in order for the Electronic Stability Control and, if equipped, the Advanced Driver Assistance System (ADAS) to function correctly after steering wheel components (including but not limited to the Steering Angle Sensor) are replaced. If the sensor is replaced or if any component that affects the alignment of this sensor is replaced or adjusted, the Steering Angle Sensor position must be relearned by the EHCU. Below is a short list of components that, if replaced or adjusted, will require the Steering Angle Sensor to be relearned.

REPLACEMENT MOBILEYE 8 COMPONENTS CAN BE OBTAINED FOR VEHICLES THAT QUALIFY UNDER THIS EXCHANGE PROGRAM.

REPLACEMENT MOBILEYE 8 COMPONENTS CAN BE OBTAINED FOR VEHICLES THAT QUALIFY UNDER THIS EXCHANGE PROGRAM.

incorrectly perceived by customers as a problem.

If a Threebond product is unavailable, we recommend that you utilize the chart below to find equivalent of similar products (when available) from Loctite and Permatex.

FROM THE REAR OF THE VEHICLE WHILE MAKING TIGHT TURNS. THIS CONDITION MAY BE DUE TO LIMITED SLIP DIFFERENTIAL LUBRICANT ADDITIVE NOT HAVING BEEN USED DURING THE LAST SCHEDULED MAINTENANCE OR IN A PREVIOUS REPAIR. THE CONDITION CAN ALSO RESULT FROM DELAYED OR SKIPPED MAINTENANCE RESULTING IN DEGRADATION OF AXLE FLUID. IF A CUSTOMER BRINGS AN AFFECTED VEHICLE IN AND COMPLAINS OF OR DESCRIBES THIS CONDITION, FOLLOW THE SERVICE PROCEDURE.

FROM THE REAR OF THE VEHICLE WHILE MAKING TIGHT TURNS. THIS CONDITION MAY BE DUE TO LIMITED SLIP DIFFERENTIAL LUBRICANT ADDITIVE NOT HAVING BEEN USED DURING THE LAST SCHEDULED MAINTENANCE OR IN A PREVIOUS REPAIR. THE CONDITION CAN ALSO RESULT FROM DELAYED OR SKIPPED MAINTENANCE RESULTING IN DEGRADATION OF AXLE FLUID.

DTC Analysis 2. DPF Early Regeneration Warning Detailed instructions on how to use the IDA are included in this bulletin.

This condition may be due to incorrect axle fluid having been used during the last scheduled maintenance or in a previous repair. The condition can also result from delayed or skipped maintenance resulting in degradation of axle fluid.

WARRANTY COVERAGE.

NOTE: After the Isuzu Tire Warranty expires, additional coverage may be available from the tire manufacturer. Refer to the tire manufacturer's warranty booklet that was provided with the vehicle at the time of the sale.

Tire Warranty, Policy, Procedure, and Claim Submission are the categories in this bulletin.

VEHICLE, THEY ARE TO AFFIX AN ODOMETER REPLACEMENT STICKER, AS THE ODOMETER IS NOT PROGRAMMABLE. THE STICKER SHOULD BE FILLED OUT COMPLETELY WITH THE DATE OF REPLACEMENT ALONG WITH THE MILEAGE FROM THE PREVIOUS ODOMETER READING, AND THE DEALER CODE OF THE DEALERSHIP REPLACING THE IPC.

The Isuzu CV SPPM (sections 2.15 and 2.16) provides detailed procedures related to vehicle storage up to and beyond 30 days. Performing these required procedures at the specified intervals will properly maintain vehicles until they are retailed. Failure to follow the procedures outlined may result in repairs and additional costs that could have been avoided. We are providing dealers with this brief overview of the recommended procedures as a reminder to maintain older inventory. Failures resulting from improper, or lack of, storage procedures are not covered under the vehicle factory warranty.

If one or more of the preceding DTCs are present, first follow the diagnostic for the DTC(s) in question. If no mechanical fault can be found during normal diagnosis, follow the service procedure in this bulletin to correct the concern.

THE AISIN TRANSMISSION IS REMOVED OR OIL PAN IS REMOVED AND REINSTALLED TO PREVENT WATER INTRUSION TO TRANSMISSION.

While Allison asserts this fluid is interchangeable with TES 295 for its transmissions, it is NOT interchangeable for all Isuzu vehicles. It is important to note that 2018 to 2023 Isuzu F-Series vehicles must USE ONLY the original TES 295 fluid. See Table 1 below for the correct application of TES 295 and TES 668 transmission fluids. Refer to the applicable Workshop Manual for additional information.

OF THE MOBILEYE 6 SYSTEM.

Regulation i.e., TCS (Traction Control System)) and ESC (Electronic Stability Control) and optional ADAS (Advanced Driver Assistance System), which includes LDWS (Lane Departure Warning System), AEBS (Automatic Emergency Braking System) and ACC (Adaptive Cruise Control (2023 & 2024MY only)), we are providing the information below to educate technicians and service personnel about important service requirements and how to recognize the switches and Multi-information Display (MID) warnings and instrument panel warning and indicator lights these recently incorporated vehicle systems.

The Exchange Program must be used when any Alpine radio or other component covered by this bulletin is repaired under warranty and may also be used for radio and component repairs not covered under warranty. Contact Alpine directly for pricing and payment methods applicable to radio and component repairs not covered under warranty.

These lenses are cracking from the effects of being washed with alkaline detergents. Alkaline detergents are typically used in industrial settings and are reactive with the paint, metals, and other materials used to make up the exterior components of Isuzu vehicles. Isuzu recommends that only neutral detergents be used when washing Isuzu vehicles. However, if alkaline detergents are used to wash an Isuzu vehicle, it is crucial that all traces of the detergent are rinsed away with water or wiped off as necessary. Allowing alkaline detergent to dry on the turn signal lenses will cause them to crack. Each Isuzu vehicle is originally equipped with an Owner's Manual that includes guidelines for the proper exterior maintenance of the vehicle. The following guidelines are typical of those found in an Isuzu Owner's Manual concerning the use of detergents on a vehicle's exterior.