# Service bulletin 18\-021\-25 REV. B

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: 11024298
- Published by NHTSA: 2025\-10\-15
- Manufacturer's number: 18\-021\-25 REV. B
- Manufacturer's date: 2025\-10\-08
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

Flash: Powertrain Control Module \(PCM\) Updates \*Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P0087\-00 \- Fuel Rail Pressure Too Low. ● P2540\-00 \- Low Pressure Fuel System Sensor Circuit Range/performance. ● P2543\-00 \- Low Pressure Fuel System Sensor Circuit Intermittent. ● P214D\-00 \- SCR NOX Catalyst Outlet Temperature Too High During Particulate Filter Regeneration. ● P242B\-00 \- Exhaust Gas Temperature Sensor Circuit Performance \- Bank 1 Sensor 3. ● P24DA\-00 \- Particulate Matter Sensor Exhaust Sample Error Bank 1. ● P20EE\-00 \- SCR Nox Catalyst Efficiency Below Threshold \- Bank 1 Catalyst 1. ● P226C\-00 \- Turbocharger Boost Control "A" Slow Response. ● P2281\-00 \- Air Leak Between MAF And Throttle Body. ● P229F\-00 \- NOX Sensor Circuit Range/performance \- Bank 1. ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P203F\-00 \- Reductant Level Too Low. ● P0423\-00 \- Heated Catalyst Efficiency Below Threshold Bank 1. ● P0263\-00 \- Cylinder 1 Contribution\-Balance. ● P0266\-00 \- Cylinder 2 Contribution\-Balance. ● P0269\-00 \- Cylinder 3 Contribution\-Balance. ● P0272\-00 \- Cylinder 4 Contribution\-Balance. ● P0275\-00 \- Cylinder 5 Contribution\-Balance. ● P0278\-00 \- Cylinder 6 Contribution/Balance. ● P026B\-00 \- Injection Timing Performance. ● P020A\-00 \- Cylinder 1 Injection Timing. ● P020B\-00 \- Cylinder 2 Injection Timing. ● P020C\-00 \- Cylinder 3 Injection Timing. ● P020D\-00 \- Cylinder 4 Injection Timing. ● P020E\-00 \- Cylinder 5 Injection Timing. ● P020F\-00 \- Cylinder 6 Injection Timing. ● P06B9\-00 \- Cylinder 1 Glow Plug Circuit Performance. ● P06BA\-00 \- Cylinder 2 Glow Plug Circuit Performance. ● P06BB\-00 \- Cylinder 3 Glow Plug Circuit Performance. ● P06BC\-00 \- Cylinder 4 Glow Plug Circuit Performance. ● P06BD\-00 \- Cylinder 5 Glow Plug Circuit Performance. ● P06BE\-00 \- Cylinder 6 Glow Plug Circuit Performance. Customers may also comment on one or more of the following: ● \*\*Inverter drops out when shifting from P to D gears. ● Diesel Exhaust Fluid \(DEF\) level gauge slow to update after a refill. ● Poor cold start performance.\*\* ● Cruise control drops out/cancels on its own. ● Engine stumble, runs rough, or a slight lack of power. The following software enhancements are also available: ● \*\*Improved troubleshooting and repair accuracy for air handling components through APT test in WiTECH. \*\* ● Reduce the occurrence of false faults Diagnostic Trouble Codes \(DTCs\) P0300\-00 and P0315\-00. ● DTC P1451\-00 re\-tune to reduce false faults. ● Improvements to allow DTC P2509\-00 faults to be cleared with wiTECH. ● Adaptive Cruise Control \(ACC\) software fix to prevent cruise control dropouts. ● Engine stumble fix for improved drivability. ● Engine stall detection allowing DTC P032F\-00 to clear after a power cycle. ● Allow multiple PROXI rewrites. ● Enable cold re\-prime \(DTC P208B\-00 improvement\). This bulletin involves inspecting and possibly reprogramming the Engine Control Module \(ECM/PCM\) with the latest available software

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11024298-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11024298-9999.pdf)

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

## Trouble codes named

P0087, P0100, P020A, P020B, P020C, P020D, P020E, P020F, P0263, P0266, P0269, P026B, P0272, P0275, P0278, P0300, P0315, P032F, P0423, P06B9, P06BA, P06BB, P06BC, P06BD, P06BE, P1451, P203F, P208B, P20EE, P214D, P226C, P2281, P229F, P242B, P24DA, P2509, P2540, P2543

## Vehicles listed

- 2025 RAM 3500

JSON: [/v1/bulletins/11024298](/v1/bulletins/11024298)

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