Service bulletin 18-078-16 REV. A

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	10136534
Published by NHTSA	2018-05-14
Manufacturer's number	18-078-16 REV. A
Manufacturer's date	2016-07-27
NHTSA component	POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN:AUTOMATIC TRANSMISSION

NHTSA's summary

Engine Oil Viscosity Upgrade And Flash Enhancements This bulletin involves reprogramming the Powertrain Control Module (PCM) and the Transmission Control Module (TCM). It also involves changing the engine oil with new 5W40 engine oil and applying a sticker to the engine oil filler cap. An addendum card will need to be added in the owner's manual. The following powertrain system improvements/enhancements are included in this software release: · Fan calibration. · Transmission calibration. · Revised oil change algorithm.

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, Automatic transmission, Transmission control module

Vehicles listed
JEEP GRAND CHEROKEE	2016
RAM 1500	2016

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

Recalls for the same vehicles and component
17V821000	2017-12-20. POWER TRAIN:AUTOMATIC TRANSMISSION:LEVER AND LINKAGE:COLUMN SHIFT
16V249000	2016-04-27. EXTERIOR LIGHTING:BRAKE LIGHTS:SWITCH; POWER TRAIN:AUTOMATIC TRANSMISSION:PARK/NEUTRAL START INTERLOCK SWITCH

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
S1709000010	2023-01-09. Service bulletin. Customer complaints may include abnormal engine noise, rough idle, lack of power, misfire. Upon investigation, it may be found that there is excessive camshaft lobe wear/lifter wear (roller failure) on one or more cam lobes and that camshaft/lifter replacement is necessary.
2101716	2022-10-24. Service bulletin. Transmission Shift And Drivability Enhancements.
W41	2022-09-26. Service bulletin. Customer Satisfaction Notification W41 Reprogram Powertrain Control Module
2101716	2022-08-22. Service bulletin. Transmission Shift And Drivability Enhancements.
1800616	2022-07-05. Service bulletin. Powertrain Diagnostic And System Enhancements.
1800116	2022-07-05. Service bulletin. This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest
1800116 REV B	2022-07-05. Service bulletin. This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest
S2025000001 Rev.	2020-12-28. Service bulletin. (Rev. B) Malfunction Indicator Lamp Illumination (MIL). Diagnostic Trouble Code (DTC) P203E ? Reductant Level Sensor 1 Circuit Intermittent-Erratic Set.
S2025000001 Rev.	2020-12-21. Service bulletin. (Rev. B) Malfunction Indicator Lamp Illumination (MIL). Diagnostic Trouble Code (DTC) P203E ? Reductant Level Sensor 1 Circuit Intermittent-Erratic Set.
18-001-16 REV. C	2020-10-26. Service bulletin. Flash: 3.0L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience bucking under hard acceleration. In addition customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation a technician may find one or more of the following Diagnostic Trouble Codes (DTCs) set in the PCM memory: · P206D-00 - Reductant Quality Sensor Circuit High. · P26AB-00 - Engine Coolant Bypass Valve Stuck. · P050E-00 - Cold Start Engine Exhaust Temperature Too Low. · U3017-00 - Control Module Timer/Clock Performance. · P026A-00 - Charge Air Cooler Efficiency Below Threshold. · P1296-00 - EGR Slow Response - Increasing Flow. · P20C2-00 - Reductant Heater 3 Control Circuit Performance. · P249C-00 - Excessive Time To Enter Closed Loop Reductant Injection Timing Control. The technician may also find the following Diagnostic Trouble Code (DTC) set in the Transmission Control Module (TCM) memory: · U1424-00 - Implausible Engine Torque Signal Received.