# Service bulletin 1800821

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: 10223345
- Published by NHTSA: 2022\-10\-17
- Manufacturer's number: 1800821
- Manufacturer's date: 2021\-05\-14
- NHTSA component: POWER TRAIN; ELECTRICAL SYSTEM

## 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: P225D\-00 \- Nox Sensor 1/1 Performance \- Signal Stuck Low. P249C\-00 \- Excessive Time To Enter Closed Loop Reductant Injection Control. P065A \- Generator System Performance. P00F4\-00 \- Humidity Sensor Circuit Low. Improved VGT cleaning to reduce false failures for P00AF field issue. P0106\-00 \- Manifold Absolute Pressure Sensor Performance. P20FB\-00 \- Reductant Pump 2 Control Performance. P200A\-00 \- Intake Manifold Runner Performance \- Bank 1. P200B\-00 \- Intake Manifold Runner Performance \- Bank 2. P2610 \- PCM Internal Engine Off Timer Performance. Change DTC number from P0101\-00 to P0109\-00 \- Mass Air Flow Sensor Performance. P015E \- Excessive Time to Enter Closed Loop Fuel Timing Control. P0534\-00 \- AC Refrigerant System A Charge Loss. P26FB\-00 \- EGR Cooler Bypass Control Stuck Closed Bank 1. P04DB\-00 \- Crankcase Ventilation System Disconnected. P204F\-00 \- Reductant System Performance. P2D2D\-00 \- Cold Start Intake Manifold Runner Performance Bank 1. P2D2E\-00 \- Cold Start Intake Manifold Runner Performance Bank 2. P2199\-00 \- Intake Air Temperature Sensor 1 / 2 Correlation. P22FA\-00 \- NOX Sensor Performance \- Slow Response High To Low Bank 1 Sensor 1. P2002\-00 \- Diesel Particulate Filter Efficiency Below Threshold. P0087\-00 \- Fuel Rail Pressure Too Low. P0128\-00 \- Thermostat Rationality\(additional software enhancement\). P0300\-00 \- Multiple Cylinder Misfire\(cold ambient temperature\). P0301\-00 \- Cylinder 1 Misfire\(cold ambient temperature\). P0302\-00 \- Cylinder 2 Misfire\(cold ambient temperature\). P0303\-00 \- Cylinder 3 Misfire\(cold ambient temperature\). P0304\-00 \- Cylinder 4 Misfire\(cold ambient temperature\). P0305\-00 \- Cylinder 5 Misfire\(cold ambient temperature\).

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10223345-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10223345-9999.pdf)

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

## Components

Electrical system, Transmission and driveline

## Trouble codes named

P0087, P00AF, P00F4, P0101, P0106, P0109, P0128, P015E, P0300, P0301, P0302, P0303, P0304, P0305, P04DB, P0534, P065A, P2002, P200A, P200B, P204F, P20FB, P2199, P225D, P22FA, P249C, P2610, P26FB, P2D2D, P2D2E

## Vehicles listed

- 2020 RAM 1500

## Recalls for the same vehicles and component

- [25V298000](/recalls/nhtsa/25V298000.md), 2025-05-08: AIR BAGS; ELECTRICAL SYSTEM:WIRING
- [2020401](/recalls/tc/2020401.md), 2020-08-28: Powertrain

## 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 \(850RE Transmission Only\)
- [114072](/bulletins/11036362.md), 2026-08-26, Service bulletin: ELECTRICAL SYSTEM. MOTOR \- WINDOW REGULATOR
- [114073](/bulletins/11036361.md), 2026-08-26, Service bulletin: ELECTRICAL SYSTEM. MOTOR \- WINDOW REGULATOR
- [S2608000033](/bulletins/11035198.md), 2026-07-23, Service bulletin: STRUCTURE:BODY; ELECTRICAL SYSTEM. Cluster Message “To Operate Tailgate Shift to Park” Vehicle is In Park
- [113069](/bulletins/11034910.md), 2026-07-08, Service bulletin: STRUCTURE:BODY; ELECTRICAL SYSTEM. SWITCH – HEADLAMP
- [113070](/bulletins/11034909.md), 2026-07-08, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. SWITCH – HEADLAMP
- [S1623000028 Rev. K](/bulletins/11033975.md), 2026-06-18, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.
- [S1623000028 REV.I](/bulletins/11033308.md), 2026-06-03, Service bulletin: ELECTRICAL SYSTEM; STRUCTURE:BODY. Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.
- [08\-208\-26 REV. A](/bulletins/11032842.md), 2026-05-20, Service bulletin: ELECTRICAL SYSTEM. Radio Message "Power Surge On USB Detected" Customers may comment on the following: ● The radio displays the message: “Power surge on USB hub detected” Fig. 1. NOTE: After the message appears, no USB devices function in the hub \(no charging, no data\). NOTE: Hub operation does not return until the vehicle undergoes a full key cycle.
- [08\-208\-26](/bulletins/11032824.md), 2026-05-20, Service bulletin: ELECTRICAL SYSTEM. Radio Message "Power Surge On USB Detected" Customers may comment on the following: ● The radio displays the message: “Power surge on USB hub detected” Fig. 1. NOTE: After the message appears, no USB devices function in the hub \(no charging, no data\). NOTE: Hub operation does not return until the vehicle undergoes a full key cycle

JSON: [/v1/bulletins/10223345](/v1/bulletins/10223345)

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