# Service bulletin 0803721

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: 10220958
- Published by NHTSA: 2022\-09\-26
- Manufacturer's number: 0803721
- Manufacturer's date: 2021\-03\-16
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Flash: Hybrid Control Processor \(HCP\) Updates This bulletin involves updating the HCP with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes \(DTCs\). P1A26\-00 \- BPCM Hybrid Battery State Of Charge Performance. P0A7E\-00 \- Hybrid/EV Battery Pack Over Temperature. U1003\-00 \- ESP Can C Bus Performance. P2534\-00 \- Ignition Switch Run/Start Position Circuit Low. P0506 \- Idle Speed Performance Lower Than Expected. P0507 \- Idle Speed Performance Higher Than Expected. One Trip DTC Changed to a Two Trip DTC.P0AC6\-00 \- Hybrid/Ev Battery Temperature Sensor 2 Circuit Performance. P0ACB\-00 \- Hybrid/Ev Battery Temperature Sensor 3 Circuit Performance. U0121\-00 \- Lost Communication With Anti\-Lock Brake System \(ABS\) Control Module. U0140\-00 \- Lost Communication With Body Control Module. U1818\-00 \- Lost Communication With ECM/PCM On D\-PT Can. U0100\-00 \- Lost Communication With ECM/PCM. U0102\-00 \- Lost Communication With Transfer Case Control Module / AWD. U1003\-00 \- ESP Can C Bus Performance. P0562 \- Battery/System Voltage Low. P060C\-00 \- Internal Control Module Main Processor Performance. U0415\-00 \- Implausible Data Received From ABS. U1850\-00 \- Implausible Data Received From PCM on D\-PT. Two Trip DTC Changed to a One Trip DTC.P0E52\-00 \- DC/DC Converter Current Sensor Circuit A Range/Performance. P0C39\-00 \- DC/DC Converter Temperature Sensor 1 Performance. P0C3E\-00 \- DC/DC Converter Temperature Sensor 2 Performance. P0E59\-00 \- DC/DC Converter Temperature Sensor C Circuit Range/Performance. P0E32\-00 \- DC/DC Converter Voltage Sensor 1 Performance. P0E37\-00 \- DC/DC Converter Voltage Sensor 2 Performance. P2C8D\-00 \- DC/DC Converter Temperature Sensor "D" Circuit Range/Performance. P2535\-00 \- Ignition Switch Run/Start Position Circuit High. P2534\-00 \- Ignition Switch Run/Start Position Circuit Low.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10220958-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10220958-9999.pdf)

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

## Components

Electrical system

## Trouble codes named

P0506, P0507, P0562, P060C, P0A7E, P0AC6, P0ACB, P0C39, P0C3E, P0E32, P0E37, P0E52, P0E59, P1A26, P2534, P2535, P2C8D, U0100, U0102, U0121, U0140, U0415, U1003, U1818, U1850

## Vehicles listed

- 2021 RAM 1500

## Recalls for the same vehicles and component

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

## Other bulletins for the same vehicles and component

- [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.
- [18\-053\-26](/bulletins/11032831.md), 2026-05-20, Service bulletin: ELECTRICAL SYSTEM. Flash: Powertrain Control Module \(PCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P219A \- Bank 1 Air\-Fuel Ratio Imbalance Bank 1. Customers may also comment on the following: ● \*\*Potential under run or stall when the vehicle utilizes the Trailer Reverse Steering Control feature and is connected to a trailer attempting to backup.\*\* This bulletin involves reprogramming the PCM with the latest available software.
- [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/10220958](/v1/bulletins/10220958)

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