# Service bulletin 1400521

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: 10230261
- Published by NHTSA: 2023\-01\-17
- Manufacturer's number: 1400521
- Manufacturer's date: 2021\-07\-17
- NHTSA component: FUEL SYSTEM, GASOLINE; ELECTRICAL SYSTEM

## NHTSA's summary

Fuel Line Blockage This bulletin involves replacing the engine fuel/EVAP forward line bundle. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code \(DTC\) has been set: P0174 \- Fuel System 2/1 Lean. In addition, the customer may notice one or more of the following conditions:Reduced acceleration. Rough starting.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10230261-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10230261-9999.pdf)

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

## Components

Electrical system, Fuel system

## Trouble codes named

P0174

## 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
- [22V767000](/recalls/nhtsa/22V767000.md), 2022-10-13: ENGINE; FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

## 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
- [9100833 REV1](/bulletins/11035064.md), 2026-07-18, Service bulletin: FUEL/PROPULSION SYSTEM. Fuel Delivery Module Before replacing the fuel module for DTCs P0461 and P062A and other not start, long crank, fuel gauge accuracy and drivability issues, the technician should disconnect the electrical connector at the pump and perform a visual inspection of the connector for and bent, spread, or pushed out terminals. Repair any issues found. Reconnect the plug and perform a push pull push to ensure the connector is fully installed. Then perform 3 keys cycles and listen to hear if the fuel pump is operational. If the fuel pump is heard that indicates that everything is operating correctly. If the pump is heard replacement is not necessary, any replacement will function in the same way.
- [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
- [9100833](/bulletins/11034342.md), 2026-07-02, Service bulletin: FUEL/PROPULSION SYSTEM. Fuel Delivery Module Before replacing the fuel module for DTCs P0461 and P062A and other not start, long crank, fuel gauge accuracy and drivability issues, the technician should disconnect the electrical connector at the pump and perform a visual inspection of the connector for and bent, spread, or pushed out terminals. Repair any issues found. Reconnect the plug and perform a push pull push to ensure the connector is fully installed. Then perform 3 keys cycles and listen to hear if the fuel pump is operational. If the fuel pump is heard that indicates that everything is operating correctly. If the pump is heard replacement is not necessary, any replacement will function in the same way.
- [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.

JSON: [/v1/bulletins/10230261](/v1/bulletins/10230261)

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