Ram bulletin 18-073-26
Ram filed this with NHTSA as a service bulletin dated Jul 22, 2026, received Jul 29, 2026, about the engine. It names 2 model years (2018–2019). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationFlash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle exhibit/set SYMPTOM: one or more of the following Diagnostic Trouble Codes (DTCs): â—� P0420 - Catalyst System Efficiency Below Threshold Bank 1. â—� P0430 - Catalyst System Efficiency Below Threshold Bank 2. â—� P0556 - Brake Booster Pressure Sensor Circuit Performance. â—� P0340 - Cam Position Sensor Circuit - Bank 1 Intake. â—� P0345 - Cam Position Sensor Circuit - Bank 2 Intake. â—� P0365 - Cam Position Sensor Circuit - Bank 1 Exhaust. â—� P0390 - Cam Position Sensor Circuit - Bank 2 Exhaust. Customers may experience one or more of the following: â—� Vehicle fails emissions inspection testing. â—� Fuel odor during frequent stop and re-start driving, during high ambient temps. In addition, the following software enhancement(s) is available: â—� OBD calibration turned off DTC "U0463 - Fuel Level Implausible" message code and will now be detected with DTC "P0463 - Fuel Level Sensor 1 Circuit High". â—� More robust trailer brake module enhancements for 3rd party aftermarket designs. â—� Cam/crank diagnostic has been turned from a 1-trip to a 2-trip MIL. â—� Change fuel level legislative reporting from a voltage to a percent scale. This bulletin involves reprogramming the PCM with the latest available software.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 18-073-26 | Service bulletin | Jul 22, 2026 | 11035323 | not yet checked |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is Ram 18-073-26 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 18-073-26 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 18-073-26 cover?
The manufacturer filed it against 2 model years: 2019 Ram ProMaster, 2018 Ram ProMaster. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.