# Service bulletin S2121000008

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: 10223243
- Published by NHTSA: 2022\-10\-17
- Manufacturer's number: S2121000008
- Manufacturer's date: 2021\-05\-03
- NHTSA component: EXTERIOR LIGHTING

## NHTSA's summary

Malfunction Indicator Lamp \(MIL\) Illumination. Diagnostic Trouble Codes \(DTCs\) P0756 ? UD Solenoid Circuit, and/or P0755 ? 2C Solenoid Circuit, Set.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10223243-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10223243-9999.pdf)

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

## Components

Lighting

## Trouble codes named

P0755, P0756

## Vehicles listed

- 2019 to 2021 RAM 2500
- 2019 to 2021 RAM 3500

## Recalls for the same vehicles and component

- [2019258](/recalls/tc/2019258.md), 2019-05-31: Lights And Instruments

## Other bulletins for the same vehicles and component

- [1800824](/bulletins/10251873.md), 2024-03-18, Service bulletin: ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; EQUIPMENT; PARKING BRAKE; BACK OVER PREVENTION; FUEL SYSTEM, GASOLINE; SERVICE BRAKES, HYDRAULIC; FUEL SYSTEM, DIESEL; EXTERIOR LIGHTING; POWER TRAIN; ELECTRONIC STABILITY CONTROL:AUTOMATIC \(ASC\). Flash: Powertrain Control Module \(PCM\) Updates 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 \(DTCs\) have been set: P0506\-00 \- Idle Control System RPM \- Lower Than Expected.P0607\-00 \- ECU Internal Performance. P20E8\-00 \- Reductant Pressure Too Low. P0301\-00 \- Cylinder 1 Misfire. P0302\-00 \- Cylinder 2 Misfire. P0303\-00 \- Cylinder 3 Misfire. P0304\-00 \- Cylinder 4 Misfire. P0305\-00 \- Cylinder 5 Misfire. P0306\-00 \- Cylinder 6 Misfire. P0299\-00 \- Turbocharger Underboost. P1D73\-00 \- AGS Performance. P0626 \- Generator Field Control Circuit High. P218F \- Reductant No Flow Detected. P2002 \- Diesel Particulate Filter Efficiency Below Threshold. P24A5 \- EGR Cooler Bypass Bank 1 Control Stuck. P0191 \- Fuel Rail Pressure Sensor Circuit Performance. P0461 \- Fuel Level Sensor 1 Performance. P0401 \- EGR System Performance. P20EE \- SCR NOx Catalyst Efficiency Below Threshold \- Bank 1. P061A \- Level 2 Torque Performance. P061B \- Internal Control Module Torque Calculation Performance. P061E \- Internal Control Module Brake Signal Performance. P062C \- ETC Level 2 MPH Performance. P0106 \- Manifold Absolute Pressure Sensor Performance \(In extreme cold ambient temperatures\). P0116 \- Engine Coolant Temperature Sensor Performance. P0420 \- Catalyst System Efficiency Bank 1. P1507 \- Crankcase Filter Restriction. P203F \- Reductant Level Too Low. P226C \- Turbocharger Boost Control ?A? Slow Response \(In extreme cold ambient temperatures\). P2579 \- Turbocharger Speed Sensor Circuit. U0101 \- Lost Communication with TCM. U02A3 \- Lost of Communication with PM Sensor. U3017 \- Control Module Timer/Clock Performance. Customers may also experience one or more of the following Power
- [1800724](/bulletins/10251872.md), 2024-03-18, Service bulletin: POWER TRAIN; ELECTRONIC STABILITY CONTROL:AUTOMATIC \(ASC\); BACK OVER PREVENTION; EXTERIOR LIGHTING; ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; SERVICE BRAKES, HYDRAULIC; FUEL SYSTEM, GASOLINE; EQUIPMENT; FUEL SYSTEM, DIESEL; PARKING BRAKE. Flash: Powertrain Control Module \(PCM\) Updates 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 \(DTCs\) have been set: P0506\-00 \- Idle Control System RPM \- Lower Than Expected. P0607\-00 \- ECU Internal Performance. P20E8\-00 \- Reductant Pressure Too Low. P0301\-00 \- Cylinder 1 Misfire. P0302\-00 \- Cylinder 2 Misfire. P0303\-00 \- Cylinder 3 Misfire. P0304\-00 \- Cylinder 4 Misfire. P0305\-00 \- Cylinder 5 Misfire. P0306\-00 \- Cylinder 6 Misfire. P0299\-00 \- Turbocharger Underboost. P1D73\-00 \- AGS Performance. P0626 \- Generator Field Control Circuit High. P218F \- Reductant No Flow Detected. P2002 \- Diesel Particulate Filter Efficiency Below Threshold. P24A5 \- EGR Cooler Bypass Bank 1 Control Stuck. P0191 \- Fuel Rail Pressure Sensor Circuit Performance. P0461 \- Fuel Level Sensor 1 Performance. P0401 \- EGR System Performance. P20EE \- SCR NOx Catalyst Efficiency Below Threshold \- Bank 1. P061A \- Level 2 Torque Performance. P061B \- Internal Control Module Torque Calculation Performance. P061E \- Internal Control Module Brake Signal Performance. P062C \- ETC Level 2 MPH Performance. P0106 \- Manifold Absolute Pressure Sensor Performance \(In extreme cold ambient temperatures\). P0116 \- Engine Coolant Temperature Sensor Performance. P0420 \- Catalyst System Efficiency Bank 1. P1507 \- Crankcase Filter Restriction. P203F \- Reductant Level Too Low. P226C \- Turbocharger Boost Control ?A? Slow Response \(In extreme cold ambient temperatures\). P2579 \- Turbocharger Speed Sensor Circuit. U0101 \- Lost Communication with TCM. U02A3 \- Lost of Communication with PM Sensor. U3017 \- Control Module Timer/Clock Performance.
- [1806823](/bulletins/10239980.md), 2023-07-31, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN; EXTERIOR LIGHTING; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Flash: Powertrain Control Module \(PCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: ? P1404 \- EGR Position Sensor Rationality Closed. ? P2457 \- Exhaust Gas Recirculation Cooling System Performance. NOTE: P1404 \- EGR Position Sensor Rationality Closed DTC can be erroneously set when P2457 \-Exhaust Gas Recirculation Cooling System Performance DTC is set. In addition, the customer may notice one or more of the following conditions: ? \*\*Power Take Off \(PTO\) disable to high engine oil temperature \(DD DP with DF3 Only\).\*\* ? In PTO mode, transmission gear engagement is abrupt and idle speed is high when transitioning From Park To Drive/Reverse Gear. This bulletin involves reprogramming the PCM with the latest available software.
- [S1625000003 Rev.](/bulletins/10231712.md), 2023-02-13, Service bulletin: BACK OVER PREVENTION; EXTERIOR LIGHTING. Malfunction Indicator Lamp \(MIL\) Illumination. NOx Sensor Diagnostic Trouble Codes \(DTCs\) Diagnosis Information.
- [9100096](/bulletins/10230407.md), 2023-01-17, Service bulletin: EXTERIOR LIGHTING:HEADLIGHTS; EXTERIOR LIGHTING. Base Headlamp Bright, Base Headlamp Black
- [S2118000001RevB](/bulletins/10230318.md), 2023-01-17, Service bulletin: EXTERIOR LIGHTING; SERVICE BRAKES, HYDRAULIC; BACK OVER PREVENTION. Malfunction Indicator Lamp \(MIL\) Illumination. Diagnostic Trouble Code \(DTC\) P0471 ? Exhaust Pressure Sensor 1 Performance, Set.
- [S2118000012](/bulletins/10230222.md), 2023-01-17, Service bulletin: EXTERIOR LIGHTING. Malfunction Indicator Lamp \(MIL\) Illumination. Diagnostic Trouble Code \(DTC\) P0607 ? ECU Internal Performance, Set.
- [S2025000007](/bulletins/10230195.md), 2023-01-17, Service bulletin: EXTERIOR LIGHTING. Malfunction Indicator Lamp \(MIL\) Illumination. Diagnostic Trouble Code \(DTC\) P218F ? Reductant No Flow Detected set.
- [0900421](/bulletins/10230142.md), 2023-01-17, Service bulletin: EQUIPMENT; EXTERIOR LIGHTING. Oil Control Valve Connector Not Seated This bulletin involves inspecting the oil control valve connector and possibly seating the connector. 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: P0013 \- Bank 1 Camshaft 2 Position Actuator Circuit Open.
- [18\-099\-22 REV. A](/bulletins/10229792.md), 2023-01-17, Service bulletin: EXTERIOR LIGHTING; FUEL SYSTEM, GASOLINE; SERVICE BRAKES, HYDRAULIC. Diesel Fuel Pump Failure and System Contamination Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: ? P0087\-00 \- Fuel Rail Pressure Too Low. ? P008A\-00 \- Low Pressure Fuel System Pressure \- Too Low. ? P0201\-00 \- Fuel Injector 1 Circuit/Open. ? P0202\-00 \- Fuel Injector 2 Circuit/Open. ? P0203\-00 \- Fuel Injector 3 Circuit/Open. ? P0204\-00 \- Fuel Injector 4 Circuit/Open. ? P0205\-00 \- Fuel Injector 5 Circuit/Open. ? P0206\-00 \- Fuel Injector 6 Circuit/Open. The customer may also notice the following: ? Engine will not start. This TSB is being replaced by recall Y78, please review Y78 for further details.

JSON: [/v1/bulletins/10223243](/v1/bulletins/10223243)

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