# Service bulletin 18\-014\-20

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.

- Type: Service bulletin
- NHTSA id: 10173374
- Published by NHTSA: 2020\-04\-06
- Manufacturer's number: 18\-014\-20
- Manufacturer's date: 2020\-02\-19
- NHTSA component: POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE

## NHTSA's summary

Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following DTCs have been set:P0456 \- EVAP System Small Leak.If DTC P0456 is present use wiTECH Small Leak Verification Test \(SLVT\)to determine if a leak is present in the system. P0128 \- Thermostat Rationality\(APAC\&EMEA with Sales Codes NA1 with NBQ or NB6 Only\). P050B \- Cold Start Ignition Timing Performance\(APAC\&EMEA with Sales Codes NA1 with NBQ or NB6 Only\). Customers may experience:Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient temperatures. Software enhancements include:Electric Vacuum Pump \(EVP\) update. Fan noise reduction. Low Speed Pre Ignition \(LSPI\) update.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10173374-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10173374-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Transmission and driveline, Software

## Trouble codes named

P0128, P0456, P050B

## Vehicles listed

- 2018 JEEP WRANGLER

## Recalls for the same vehicles and component

- [18V332000](/recalls/nhtsa/18V332000.md), 2018-05-17: ELECTRICAL SYSTEM:SOFTWARE; VEHICLE SPEED CONTROL:CRUISE CONTROL; ELECTRICAL SYSTEM:WIRING

## Other bulletins for the same vehicles and component

- [ReferenceY40](/bulletins/10251816.md), 2024-03-18, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE. Customer Satisfaction Notification Y40 Control Module Software Updates
- [BulletinA](/bulletins/10240002.md), 2023-07-31, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Customer Satisfaction Notification ZD7 \- Radio Software Update
- [2400721](/bulletins/10223497.md), 2022-10-17, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM. Flash: HVAC Diagnostic and System Updates This bulletin involves reprogramming the HVAC control module with the latest available software. The customer may notice one or more of the following:Intermittent change of smell or humidity level in vehicle. An intermittent blast of warm air when A/C is on. Intermittent increase of outside air through the HVAC system. In addition, the following software enhancement is also available:Improvements for customer concerns of 'cabin too warm', specifically in the mid ambient temperature range 4.5\-15.5 °C \(40\-60 °F\).
- [08\-133\-21](/bulletins/10218559.md), 2022-08-22, Service bulletin: EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM:SOFTWARE. UAQ and UCQ Radio Enhancements This bulletin involves inspecting and if required, updating the radio software level to: 39.6.The repair procedure must be followed step by step. If the radio is not updated with the correct software level at the correct time the radio can be damaged. If the radio was damaged by not following the repairprocedure the radio may need to be replaced. Customers may experience one or more of the following: Lost radio presets. SXM favorite song not displaying/playing. Radio display screen is black, intermittent. Radio freeze intermittent. Incorrect navigation address/location/directions. Bluetooth pair or connection issue. Radio channel change by itself. SXM icon inoperative. Backup camera has black display screen. High pitch chime noise. Contact list not loading. Device not supported message. Remote app inoperative. Travel\-Link fuel price incorrect. Backup camera gridlines missing. Unable to adjust volume. In addition the following enhancements are included: Heavy Duty \(HD\)Truck USB HUB improvements. HD Truck heated steering wheel improvements.
- [08\-074\-20 REV. D](/bulletins/10184767.md), 2020-12-28, Service bulletin: STEERING; EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. Improved Steering Feel This bulletin involves replacing the steering gear and updating the Electric Hydraulic Power Steering \(EHPS\) software, checking sales codes and performing vehicle reconfig, if required.Review and perform all step necessary to complete the Repair Procedure. If any steps are missed this may lead to undesired handling characteristics. The customer may describe one or more of the following:Steering wander. Vehicle has a lead/pull to the right or left.The lead/pull will be more noticeable in hot ambient temperatures. Steering feels like it has excess play.This Technical Service Bulletin \(TSB\) repair will NOT correct a sustained steering shake, shimmy or vibration. Video aid has been developed for this issue. Refer to the detailed service procedures available in DealerConnect\>Service Library under: Service Info\>19 \- Steering / Linkage / Damper, Steering /Removal and Installation.
- [08\-074\-20 REV. D](/bulletins/10184467.md), 2020-12-21, Service bulletin: STEERING; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. Improved Steering Feel This bulletin involves replacing the steering gear and updating the Electric Hydraulic Power Steering \(EHPS\) software, checking sales codes and performing vehicle reconfig, if required.Review and perform all step necessary to complete the Repair Procedure. If any steps are missed this may lead to undesired handling characteristics. The customer may describe one or more of the following:Steering wander. Vehicle has a lead/pull to the right or left.The lead/pull will be more noticeable in hot ambient temperatures. Steering feels like it has excess play.This Technical Service Bulletin \(TSB\) repair will NOT correct a sustained steering shake, shimmy or vibration. Video aid has been developed for this issue. Refer to the detailed service procedures available in DealerConnect\>Service Library under: Service Info\>19 \- Steering / Linkage / Damper, Steering /Removal and Installation.
- [08\-098\-20](/bulletins/10183080.md), 2020-11-30, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. UCQ Radio Enhancements This bulletin has been canceled. The software on the Uconnect site will be turned off. Any USB flash drives that has this software on it must be deleted. If the radio is updated with 28.3 software it may cause more issues with the radio and dissatisfy the customer. Enhanced software should be available the first quarter of 2021.
- [08\-091\-20](/bulletins/10183070.md), 2020-11-30, Service bulletin: EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; ELECTRICAL SYSTEM:SOFTWARE. UAQ Radio Enhancements This bulletin has been canceled. The software on the Uconnect site will be turned off. Any USB flash drives that has this software on it must be deleted. If the radio is updated with 28.3 software it may cause more issues with the radio and dissatisfy the customer. Enhanced software should be available the first quarter of 2021.
- [9004309](/bulletins/10182995.md), 2020-11-30, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; STEERING. GEAR, Power Steering When installing this gear refer to published service information. The power steering pump software must be updated, and vehicle configuration updated to ensure proper steering feel.
- [S2008000130](/bulletins/10180233.md), 2020-09-28, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. Radio UConnect GPS Based Trip Computer Missing

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