# Service bulletin 21\-015\-25

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: 11014153
- Published by NHTSA: 2025\-02\-11
- Manufacturer's number: 21\-015\-25
- Manufacturer's date: 2025\-02\-05
- NHTSA component: POWER TRAIN
- Manufacturer's system: Transmission Control Module

## NHTSA's summary

"Flash: Transmission Control Module \(TCM\) Updates The customer must describe one or more of the following: ● Bump or jerk felt during Engine Start/Stop \(ESS\) operation in normal and snow modes. ● Bump during tip\-in downshift while in Normal or Sport modes. ● Transmission shifting concerns when vehicle has less than 1500 miles \(2414 Km\). ● Driveability concerns and not holding correct gear during downgrade, snow mode and accelerator tip\-out maneuvers. This bulletin involves reprogramming the BPCM, MCP A, MCP B and the EVCU with the latest available software and then, if needed, performing a Wheel End Disconnect Position Learn routine"

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11014153-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11014153-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2025 RAM 1500

## 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 \(850RE Transmission Only\)
- [18\-071\-26 REV. A](/bulletins/11038312.md), 2026-10-07, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*P2237\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1. ● P2240\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1. ● P2251\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1. ● P2254\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1. ● P2243\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. ● P2247\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1. ● P015B\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 1 Sensor 1. ● P015D\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 2 Sensor 1. ● P0E7C\-00 \- Coolant Bypass Valve "B" Control Circuit Low. ● P0E7D\-00 \- Coolant Bypass Valve "B" Control Circuit High. ● P0E7E\-00 \- Coolant Bypass Valve "B" Control Circuit Range/Performance. ● P0E7F\-00 \- Coolant Bypass Valve "B" Control Circuit Stuck/Open. ● U063C\-00 \- Lost Communication With Coolant Bypass Valve Actuator "B". ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P0101\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit Range/Performance. ● P0461\-00 \- Fuel Level Sensor "A" Circuit Range/performance. ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low. ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance. ● B1810\-00 \- Driver Door Shorted Low. ● B25C7\-00 \- Redundant Driver Door Shorted Low.\*\* ● U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.
- [S2418000012 REV.C](/bulletins/11037155.md), 2026-09-08, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Mil On/Check Engine Lamp \(CEL\) On, Engine Runs Rough
- [18\-077\-26](/bulletins/11036359.md), 2026-08-26, Service bulletin: POWER TRAIN; ENGINE. Flash: Powertrain Control Module \(PCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P0300 \- Multiple Cylinder Misfire. Customers may experience one of the following: ● Vehicle runs rough on initial cold start only after an overnight or extended soak. \*\*This bulletin involves reprogramming the PCM with the latest available software.\*\*
- [18\-071\-26](/bulletins/11035321.md), 2026-07-29, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.\*\* ● P06DD\-00 \- Engine Oil Pressure Control Circuit Performance/Stuck Off. ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High. ● P0071\-00 \- Ambient Air Temperature Sensor Performance. ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected. ● P1CEA\-00 \- Boost Side EVAP Purge System Performance. ● P05BD\-00 \- Stop\-start Mode Switch Range/Performance. ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking. ● U0673\-00 \- Lost Communication With Ion Sense Module. ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \- in ACTIVE or STORED status. ● P0325\-00 \- Knock/Combustion Vibration Sensor 1 Circuit \- in ACTIVE or STORED status. ● P0330\-00 \- Knock/Combustion Vibration Sensor 2 Circuit \- in ACTIVE or STORED status. ● P032A\-00 \- Knock\-Combustion Vibration Sensor C Circuit \- in ACTIVE or STORED status. ● P018B\-00 \- Fuel Pressure Sensor "B" Circuit Range/Performance \- in ACTIVE or STORED status. ● P2AF6\-00 \- Starter Relay 3 Stuck Off \- in ACTIVE or STORED status. ● P0300\-00 \- Multiple Cylinder Misfire \- in ACTIVE or STORED status set during cold start catalyst heating. ● P0301\-00 \- Cylinder 1 Misfire \- in ACTIVE or STORED status set during cold start catalyst heating. ● P0302\-00 \- Cylinder 2 Misfire \- in ACTIVE or STORED status set during cold start catalyst heating. ● P0303\-00 \- Cylinder 3 Misfire \- in ACTIVE or STORED status set during cold start catalyst heating. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [112748](/bulletins/11033955.md), 2026-06-18, Service bulletin: POWER TRAIN. SHIFTER \- TRANSMISSION
- [112747](/bulletins/11033954.md), 2026-06-18, Service bulletin: POWER TRAIN. SHIFTER \- TRANSMISSION
- [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.
- [109011](/bulletins/11026815.md), 2025-12-23, Service bulletin: POWER TRAIN. VALVE BODY \& CONTROL UNIT – TRANSMISSION

JSON: [/v1/bulletins/11014153](/v1/bulletins/11014153)

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