# Service bulletin 18\-076\-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: 10181595
- Published by NHTSA: 2020\-10\-26
- Manufacturer's number: 18\-076\-20
- Manufacturer's date: 2020\-09\-03
- NHTSA component: POWER TRAIN

## 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 has been set:P0339 \- Crankshaft Position Sensor Intermittent. P0335 \- Crankshaft Position Sensor Circuit. P258B \- Electronic Vacuum Pump 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.The customer may comment on one or more of the following:?Ready Not Ready? appearing message in the Electronic Vehicle Information Center \(EVIC\) while driving and before an Engine Stop Start \(ESS\) event. The engine may exhibit a crank and fail to start situation. Vehicle has a rough idle only after cold start. The radiator cooling fan is stuck on for a long time while driving. Coolant temp/check gauges light illuminated in the Instrument Panel Cluster \(IPC\). In addition, the following software enhancements are also available:Radiator cooling fan operation strategy. Updated electric vacuum pump calibration to reduce pump wear. Small leak detection in\-use monitor performance ratio.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181595-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181595-9999.pdf)

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

## Components

Transmission and driveline

## Trouble codes named

P0335, P0339, P0456, P258B

## Vehicles listed

- 2019 RAM 1500

## Recalls for the same vehicles and component

- [2020401](/recalls/tc/2020401.md), 2020-08-28: Powertrain
- [20V080000](/recalls/nhtsa/20V080000.md), 2020-02-13: POWER TRAIN:TRANSFER CASE \(4\-WHEEL DRIVE\)
- [2019206](/recalls/tc/2019206.md), 2019-04-26: Powertrain
- [19V324000](/recalls/nhtsa/19V324000.md), 2019-04-25: POWER TRAIN:DRIVELINE:DRIVESHAFT
- [18V556000](/recalls/nhtsa/18V556000.md), 2018-08-23: POWER TRAIN:AXLE ASSEMBLY

## Other bulletins for the same vehicles and component

- [S2621000004](/bulletins/11038329.md), 2026-10-07, Service bulletin: POWER TRAIN. The Customer May Complain About a Popping Noise, Grinding Noise, or an Intermittent No Reverse or Forward Transmission Engagement. The Tech May Find Damaged and/or Worn Transmission Output Shaft Splines \(850RE Transmission Only\)
- [S2621000003 REV.A](/bulletins/11030138.md), 2026-03-18, Service bulletin: POWER TRAIN. The vehicle will exhibit a service transmission/check engine warning indicator for the following transmission models: 845RE, 8HP45, 850RE, 8HP50, 8HP70, 8HP75, 8HP75\-PHEV, 8HP75\-LCV, 8HP90, 8HP95. Transmissions may exhibit the following diagnostic codes: P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
- [S2621000003](/bulletins/11029770.md), 2026-03-05, Service bulletin: POWER TRAIN. Service transmission/check engine warning indicator for the 850RE, 8HP50, 8HP70, 8HP75, 8HP75\-PHEV transmissions that have fault codes P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13.
- [9100627](/bulletins/11020855.md), 2025-07-23, Service bulletin: POWER TRAIN. To inform dealers about the 850RE valve body PN: R8348504A connector: the original 16\-pin connector included six pins that were not used in this application. To simplify the design, the connector has been optimized and updated to a 10\-pin configuration.
- [03\-004\-25](/bulletins/11018463.md), 2025-05-19, Service bulletin: POWER TRAIN. "Front Drive Unit Vibrates Customers may experience the following: ● Vibration in the front of the vehicle from the front drive unit This bulletin involves replacing the right front output shaft."
- [9100534 Rev 1](/bulletins/11018452.md), 2025-05-19, Service bulletin: POWER TRAIN. Transmission "Transmission For transmission concerns related to DTCs P0733\-00, P1DA8\-00, and/or P1D92\-00, a repair is available, and transmission replacement is NOT required. Please reference TSB 21\-009\-25 Rev. A, for details on D\-clutch replacement. Please also note, visible ""glitter"" or debris in the pan and fluid color/condition/odor is NOT an indicator of transmission health and should not be used as the reason for unit replacement. Complete unit replacements instead of repairs for these DTCs may be subject to chargeback."
- [9100534](/bulletins/11016061.md), 2025-03-28, Service bulletin: POWER TRAIN. "Transmission For transmission concerns related to DTCs P0733\-00, P1DA8\-00, and/or P1D92\-00, a repair is available, and transmission replacement is NOT required. Please reference TSB 21\-009\-25 Rev. A, for details on D\-clutch replacement. Please also note, fluid color/condition/odor is NOT an indicator of transmission health and should not be used as the reason for unit replacement. Complete unit replacements instead of repairs for these DTCs may be subject to chargeback."
- [03\-001\-25 REV. A](/bulletins/11014369.md), 2025-02-19, Service bulletin: POWER TRAIN; UNKNOWN OR OTHER. "Clicking Noise While In 4WD Customers may experience the following: ● Ratcheting, click, or clicking noise in 4WD while turning. This bulletin involves replacing the front driveshaft."
- [03\-001\-25](/bulletins/11014157.md), 2025-02-11, Service bulletin: POWER TRAIN. "Clicking Noise While In 4WD ustomers may experience the following: ● Ratcheting, click, or clicking noise in 4WD while turning. his bulletin involves replacing the front driveshaft"
- [101232](/bulletins/11010205.md), 2024-11-07, Service bulletin: POWER TRAIN. Plate \- Planetary

JSON: [/v1/bulletins/10181595](/v1/bulletins/10181595)

[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%2018-076-20&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10181595&vehicle=Service%20bulletin%2018-076-20)