Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2018 4500HD/4500XD Medium Duty.
The 2018 Chevrolet 4500HD/4500XD Medium Duty enters the historical record with a notably quiet owner-complaint profile — just a single report logged, centered on service brakes — while carrying two recalls, a combination that suggests isolated corrective actions rather than systemic issues. With complaint volume this low, the model year sits at the favorable end of the nameplate's reliability spectrum, indicating that most units have operated without drawing significant owner dissatisfaction or regulatory intervention. For researchers, that means the 2018 iteration can be treated as a largely trouble-free baseline in the medium-duty lineup, with the brake-focused complaint and dual recalls serving as the only documented friction points worth flagging in a fleet or ownership assessment.
Capacities, torques and tune-up values from the factory service manual.
The firing order is 1-8-7-2-6-5-4-3.
| Cylinder Firing Order | 1-3-4-2 |
| Cylinder Firing Order | 1-3-4-2 |
| Cylinder Firing Order | 1-8-7-2-6-5-4-3 |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
Owner complaints about the 2018 Chevrolet 4500HD/4500XD Medium Duty dominate in one area — the service brakes, 1 of 1 reports (100%), well ahead of the next concern. None of this vehicle's 2 recall campaigns target the service brakes, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 0 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the service brakes pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.
All 1 complaints on record, top 1 components.
Source: NHTSA Office of Defects Investigation complaint database.
Showing 2 of 2 campaigns on record for this vehicle.
Excellance, Inc. (Excellance) is recalling certain 2018 Ambulances and Emergency Vehicles built on Ford E-350, E-450, F-650, F-550 4x4, Chevrolet G4500, G4500 Diesel, C3500, G3500, Freightliner M2, International 4300… Remedy: Excellance has notified owners, instructing them to contact Whelen to have the brake lights replaced, free of charge. The recall began on March 21, 2019. Owners may contact Whelen…
North Central Emergency Vehicles (North Central) is recalling certain 2016-2018 Ambulances remounted on Ford E-350 and E-450 and Chevrolet G4500 chassis equipped with Whelen brake lights. Depending on the specific… Remedy: North Central will notify owners and dealers will replace the brake lights, free of charge. The recall began May 20, 2019. Owners may contact North Central Emergency Vehicles…
Showing 5 of 285 bulletins on record with NHTSA.
| Bulletin | Date | Component | Summary |
|---|---|---|---|
| PIT3271Q | 2026-04-01 | Unknown Or Other | This preliminary information communicates information about how to determine if a wheel… |
| PIP6104 | 2026-03-09 | Unknown Or Other | This Preliminary information communicates the steps on how to save a GDS2 Session Log and… |
| PIP4902V | 2026-03-09 | Unknown Or Other | This preliminary information advises a dealer on how to email GDS2 session logs into… |
| PIP4902U | 2026-01-08 | Unknown Or Other | This preliminary information advises a dealer on how to email GDS2 session logs into… |
| PIT5214G | 2025-11-20 | Unknown Or Other | This Preliminary Information communication provides information to the technician about… |
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Cross-vehicle references for the kinds of data on this page.
NHTSA lists 2 recall campaign(s) for this model year. Check your specific vehicle by VIN.