# Service bulletin 18\-034\-19 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.

- Type: Service bulletin
- NHTSA id: 10170374
- Published by NHTSA: 2020\-01\-21
- Manufacturer's number: 18\-034\-19 REV. A
- Manufacturer's date: 2019\-12\-04
- NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM

## NHTSA's summary

Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. The customer may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following DTCs:P061A \- Level 2 Torque Performance. P0507 \- Idle Speed Performance Higher Than Expected. P0456 \- EVAP System Small Leak. Customers may also describe the following condition:Excessive fan noise when the A/C is on MAX output. Other enhancements included in this update:Electric vacuum pump \(EVP\) update. Fan noise reduction.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10170374-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10170374-9999.pdf)

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

## Components

Electrical system, Transmission and driveline, Automatic transmission, Transmission control module

## Trouble codes named

P0456, P0507, P061A

## Vehicles listed

- 2018 JEEP WRANGLER

## Recalls for the same vehicles and component

- [18V280000](/recalls/nhtsa/18V280000.md), 2018-05-01: POWER TRAIN:AUTOMATIC TRANSMISSION

## Other bulletins for the same vehicles and component

- [S2325000006](/bulletins/10241022.md), 2023-08-21, Service bulletin: ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Customer complaint may include a MIL\-on or check engine lamp on condition.
- [S1808000152](/bulletins/10234438.md), 2023-04-17, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). CEL \(Check Engine Lamp\) Illuminates, Recent PCM Replace or Flash Update Performed, Diagnostic Trouble Codes \(DTCs\) P057B Brake Pedal Position Sensor Circuit Performance, P1572 Brake Pedal Stuck, C0042\-54 Brake Pedal Missing Calibration
- [S2207000002](/bulletins/10229470.md), 2023-01-09, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLER/RADIATOR:HOSES AND FITTINGS; UNKNOWN OR OTHER. Coolant leak
- [1801420](/bulletins/10223588.md), 2022-10-17, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). 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:P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected\(APAC, EMEA and LATAM Only\). P04FC \- Crankcase Ventilation System Performance\(APAC, EMEA and LATAM Only\). P2453 \- Particulate Filter Pressure Sensor "A" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\). P245F \- Particulate Filter Pressure Sensor "B" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\). 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. P0171 \- Fuel System 1/1 Lean\(LATAM Only\). P0172 \- Fuel System 1/1 Rich\(LATAM Only\). P0128 \- Thermostat Rationality\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). P050B \- Cold Start Ignition Timing Performance\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). Customers may comment on one or more of the following:Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient temperatures. Software enhancements also included in this update:Electric Vacuum Pump \(EVP\) update. Fan noise reduction. Low Speed Pre Ignition \(LSPI\) update.
- [1801820](/bulletins/10221766.md), 2022-09-26, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. The customer may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find one or more ofthe following DTCs: P04FC \- Crankcase Ventilation System Performance. P0456 EVAP System Small Leak.If DTC P0456 is present use the wiTECH Small Leak Verification Test \(SLVT\) to determine if a leak is present in the system. P061A \- Level 2 Torque Performance. P0507 \- Idle Speed Performance Higher Than Expected. Customers may also describe the following condition:Excessive fan noise when the A/C is on MAX output. Other enhancements included in this update: Electric vacuum pump \(EVP\) update. Fan noise reduction.
- [1803621](/bulletins/10221200.md), 2022-09-26, Service bulletin: EXTERIOR LIGHTING; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; BACK OVER PREVENTION; ELECTRICAL SYSTEM; SERVICE BRAKES, HYDRAULIC; FUEL SYSTEM, GASOLINE. 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 f Customers may comment on one or more of the following: Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient temperatures. The following software enhancements are also included in this update : Electric Vacuum Pump \(EVP\) update. Fan noise reduction. Low Speed Pre Ignition \(LSPI\) update.
- [S1918000008 Rev.](/bulletins/10215854.md), 2022-07-18, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); EQUIPMENT; POWER TRAIN:MANUAL TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Customer?s complaint may include a MIL\-on with one or more of the following DTCs \(Active, Pending, or Stored\) in the PCM: P0133, P0137, P0171, P0300, P2096. The root cause could be due to oil leaking from Bank 1 valve cover seal on to the 1/2 \(Bank 1 downstream\) O2 sensor. This can adversely affect the 1/2 O2 sensor signal reading and lead to listed DTCs. Before performing normal diagnostic routines for the above codes, check for the condition listed above.
- [S2018000012](/bulletins/10184702.md), 2020-12-28, Service bulletin: ELECTRICAL SYSTEM; ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Check engine lamp on. Fault code P0244\- TURBOCHARGER/SUPERCHARGER WASTEGATE SOLENOID "A" RANGE/PERFORMANCE is set in the Powertrain Control Module \(PCM a.k.a. ECM\) after the turbocharger assembly has been replaced.
- [S2018000012](/bulletins/10184402.md), 2020-12-21, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Check engine lamp on. Fault code P0244\- TURBOCHARGER/SUPERCHARGER WASTEGATE SOLENOID "A" RANGE/PERFORMANCE is set in the Powertrain Control Module \(PCM a.k.a. ECM\) after the turbocharger assembly has been replaced.
- [18\-014\-20 REV. B](/bulletins/10177533.md), 2020-07-27, Service bulletin: ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). 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:P2C90 \- Crankcase Ventilation System \- Hose "A" Disconnected\(APAC, EMEA and LATAM Only\). P04FC \- Crankcase Ventilation System Performance\(APAC, EMEA and LATAM Only\). P2453 \- Particulate Filter Pressure Sensor "A" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\). P245F \- Particulate Filter Pressure Sensor "B" Circuit Range/Performance\(APAC and EMEA only equipped with Gas Particulate Filter \(GPF\). 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. P0171 \- Fuel System 1/1 Lean\(LATAM Only\). P0172 \- Fuel System 1/1 Rich\(LATAM Only\). P0128 \- Thermostat Rationality\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). P050B \- Cold Start Ignition Timing Performance\(Sales Codes NA1 with NBQ or NB6 Only \- APAC and EMEA Only\). Customers may comment on one or more of the following:Excessive fan noise when the A/C is on MAX output. Rough idle at engine start up in colder ambient temperatures. Software enhancements also included in this update:Electric Vacuum Pump \(EVP\) update. Fan noise reduction. Low Speed Pre Ignition \(LSPI\) update.

JSON: [/v1/bulletins/10170374](/v1/bulletins/10170374)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2018-034-19%20REV.%20A&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10170374&vehicle=Service%20bulletin%2018-034-19%20REV.%20A)