Dodge›RAM 1500, 2500 Pickup›2003›5.9L Diesel/dodge/ram-1500-2500-pickup/2003/5-9l-diesel/

DR platform

2003 Dodge RAM 1500, 2500 Pickup — 5.9L Diesel

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 RAM 1500, 2500 Pickup 5.9L Diesel. Covers both the standard and High Output 5.9L Diesel.

Engine 5.9L DieselTransmission Automatic 4-spd

The 2003 Dodge RAM 1500 and 2500 Pickup, riding on the DR platform, is powered by a 5.9L diesel engine mated to a 4-speed automatic transmission, and its EPA ratings of 12 city/16 highway/13 combined mpg reflect the era’s heavy-duty fuel consumption. A notable maintenance spec is the 5.0-quart oil capacity requiring 10W-30 API viscosity, a detail that underscores the engine’s robust design. In terms of reliability, this model year logged 661 owner complaints—with the top issue falling under “Structure”—and carries nine recalls, placing it among the more problematic years for the RAM lineup and signaling that researchers should pay close attention to body and frame integrity when evaluating these trucks.

Model year2004 2003

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity5.0 qtOEM · verified

Engine oil type10W-30 APIOEM · verified

Lug nut torque135 ft-lbsOEM · verified

EPA fuel economy12/16/13 mpgEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 65 · 750 CCA battery, OE oil filter 05281090AB. Note the factory fuel filter is now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 65 · 750 CCAOEM · verified

Tire sizeP265-70R17OEM · verified

Wheel / rim8 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter	05281090AB alt 04781452BF
Engine air filter	68441763AA
Fuel filter	04798825AD discontinued · alt 04897498AA
Spark plug	68303918AA alt 68303913AA
Battery	BB65F121AA
Front wiper blades	55077100AE
Serpentine belt	05135746AA alt 53032307AC
Thermostat	53021051AB alt 52028898AJ

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

Transmission

Automatic 4-spd

Dimensions & weight NHTSA vPIC

Overall length	228.7 in
Overall width	78.7 in
Overall height	79.5 in
Wheelbase	127.2 in
Curb weight	4482 lb
Track (front / rear)	66.9 / 65.7 in

Ratings & economy EPA / vPIC

EPA city / highway / combined	12 / 16 / 13 mpg
Drivetrain	Rear-Wheel Drive
Recommended fuel	Regular Gasoline

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 5.0 qt of 10W-30 API engine oil, Synthetic · 75W-140 · GL-5 · 75W-90 in the differential, DOT 3 brake fluid. Torque lug nuts to 135 ft-lbs, the oil drain plug to 25.0 ft-lbs. The firing order is 1-10-9-4-3-6-5-8-7-2.

Lubricants & capacities

Brake Fluid	DOT 3
Differential Gear Oil	Synthetic · 75W-140 · GL-5 · 75W-90
Differential Gear Oil Capacity	4.9 Pints,
Differential Gear Oil	Synthetic · 75W-140 · GL-5 · 75W-90
Differential Gear Oil Capacity	8 Pints,
Engine Coolant	HOAT · MS9769
Engine Oil	10W-30 · API
Engine Oil Capacity	5.0 qt

Engine torques

Connecting Rod (Large End) Bearings	48 ft-lbs
Engine Flywheel Bolts	100 ft-lbs
Engine Flywheel Bolts	55 ft-lbs
Exhaust Manifold to Cylinder Head Bolts	25 ft-lbs
Engine Oil Pan Drain Plug	44.0 ft-lbs
Engine Oil Pan Drain Plug	37.0 ft-lbs
Engine Oil Pan Drain Plug	25.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs	30 ft-lbs

Chassis torques

Leaf Spring to Axle (U-bolts)	110.0 ft-lbs
Lug Nuts	135 ft-lbs
Transfer Case Fill Plug	30.0-40.0 ft-lbs
Transfer Case Drain Plug	30.0-40.0 ft-lbs
Front Wheel Hub	175 ft-lbs
Front Wheel Hub	185 ft-lbs

Ignition

Cylinder Firing Order	1-8-4-3-6-5-7-2
Cylinder Firing Order	1-10-9-4-3-6-5-8-7-2
Curb Idle Speed (No Load)	700 rpm
Curb Idle Speed Variance (No Load)	200 rpm
Spark Plug Manufacturer	Champion
Spark Plug Type	RC12LC4
Spark Plug Gap	0.040 in
Spark Plug Torque	30.0 ft-lbs

Battery & A/C

Refrigerant	R134a
Refrigerant Capacity	1.63 lbs
Oil Group	PAG
Oil Type	SP-15
Oil Capacity	6.00 oz
Standard BCI Group Number	65
Standard BCI Cranking Performance	750 cca
Optional BCI Group Number	27

Service checks

Pressure Test	15 psi
Radiator Cap Pressure Relief	14-18 psi
Regulated Fuel System Pressure (With Vacuum)	47.0-51.0 psi
Injector Primary Resistance	13-16 @ 68 degreesF ohms
Engine Compression	100 Minimum psi
Engine Oil Pressure	30-80 psi
Engine Oil Pressure RPM	3000 rpm
Engine Oil Pressure	30 psi

Brakes

Torque Caliper to Bracket	24 ft-lbs
Torque to Knuckle	130 ft-lbs / 100 ft-lbs
Rotor Max Parallel Variation	0.001 in
Rotor Runout Limit	0.005 in
Rotor Nominal Thickness From	1.1 in / 1.181 in
Rotor Nominal Thickness To	1.1 in / 1.181 in
Rotor Discard at or Under	1.039 in / 1.117 in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages

22 ft. lbs., Step 2: 44 ft. lbs., Step 3: 60

22 ft. lbs

Cylinder Head — tightening sequence 2 stages

1	43.0 ft. lbs.	43 ft. lbs
2	105.0

Intake Manifold to Engine Bolts — tightening sequence 1 stages

6 ft. lbs. ( 1 ft. lbs. at a time.), step 2: bolts 5-12: 6 ft. lbs., step 3: all to 6 ft. lbs., step 4: all to 12 ft. lbs., step 5: all to 12

6 ft. lbs

Main Bearings — tightening sequence 1 stages

37 ft. lbs., Step 2: 59 ft. lbs., Step 3: 90

37 ft. lbs

Oil Pump to Cylinder BLock Bolts/Studs — tightening sequence 1 stages

6 ft. lbs., Step 2: 18

6 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 6,000 mi; spark plugs every 60,000 mi; coolant every 6,000 mi. The big-interval services (every 6,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 6,000 mi	Engine Coolant System (leak inspection) · Engine Oil (drain & refill) · Tire & Wheel Assembly (inspect)
Every 7,500 mi	Brake Hydraulic System (inspect fluid level) · Brake Line (inspect) · Suspension System (inspect)
Every 12,000 mi	Accessory Drive Belt (inspect) · Steering Linkage (inspect)
Every 15,000 mi	Engine Oil Filter (replace)
Every 21,000 mi	Suspension Ball Joint (inspect)
Every 30,000 mi	Engine Air Filter Element (replace) · Engine Coolant System (drain, flush & refill) · PCV Valve (inspect)
At 45,000 mi	Engine Coolant System (drain, flush & refill)
At 60,000 mi	PCV Valve (inspect)
Every 60,000 mi	Accessory Drive Belt (inspect) · PCV Valve (inspect) · Spark Plug Wires (replace)

Owner how-tos

Condensed service procedures for routine maintenance. Procedures that require dealer diagnostic equipment are identified and summarized only.

Common procedures

Key fob — remote (RKE) programming programming new fob buttons Dealer tool OEM · verified

Tool required	DRBIII scan tool (dealer / locksmith)
Why	Transmitter codes are written into the receiver in the passenger door module

Anti-theft (SKIS) — module initialization after immobilizer module replacement Dealer tool OEM · verified

When needed	After Sentry Key Immobilizer Module (SKIM) replacement
Tool required	DRBIII scan tool
Also required	The vehicle's four-digit PIN code

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

Owner complaints about the 2003 Dodge RAM 1500, 2500 Pickup lead in one area — the structure, 124 of 661 reports (19%), well ahead of the next concern. None of this vehicle's 9 recall campaigns target the structure, so those reports read as owner-reported wear-and-tear rather than an acknowledged defect. 30 of the reports describe a crash and 2 a fire — a small share of the total, but worth weighing against the structure 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.

Open recalls

NHTSA campaigns

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

661

Owner complaints

30 involved a crash · 2 a fire

Owner complaints filed with NHTSA, by component

All 661 complaints on record, top 8 components.

Structure124

Air Bags113

Steering70

Steering,Suspension51

Suspension45

Power Train38

Unknown Or Other27

Visibility24

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 9 campaigns on record for this vehicle.

15V312000Air Bags:Frontal:Passenger Side:Inflator ModuleReported 27/05/2015

Chrysler (FCA US LLC) is recalling certain model year 2003 Dodge Ram 1500, 2500, and 3500 trucks manufactured August 29, 2002, to July 25, 2003 to address a safety defect in the passenger side frontal air bag inflator… Remedy: Owners are advised not to drive their vehicle until the recall repair is complete. Owners are advised not to drive their vehicles until the remedy is completed. Chrysler will…

11V350000Steering:Linkages:Tie Rod AssemblyReported 06/07/2011

CHRYSLER IS RECALLING CERTAIN MODEL YEAR 2008-2011 DODGE RAM 2500/3500 4X4, MANUFACTURED FROM FEBRUARY 14, 2008, THROUGH MARCH 28, 2011; MODEL YEAR 2008-2011 DODGE RAM 3500 CAB CHASSIS 4X2, MANUFACTURED FROM FEBRUARY… Remedy: DEALERS WILL INSPECT THE TIE ROD ENDS FOR RELATIVE ORIENTATION AND REPLACE THE LEFT OUTER TIE ROD AS REQUIRED AND PERFORM A FRONT END TOE ALIGNMENT AS NEEDED. THIS SERVICE WILL BE…

Technical service bulletins NHTSA · verified

Showing 5 of 32 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
S1203000003 REV.A	2026-06-26	Service Brakes	Trac-Rite Operation Diagnosis, Chatter, Shudder, Moving From A Stop And Turning
101232	2024-10-29	Power Train	Plate - Planetary
9004275	2020-07-22	Electrical System	KEY, Master If replacing the key/FOBIK on a WJ, KJ, TJ, or PT Cruiser, use the "AC" NIC…
9004275	2020-07-22	Electrical System	KEY, Master If replacing the key/FOBIK on a WJ, KJ, TJ, or PT Cruiser, use the "AC" NIC…
23-015-20	2020-04-30	Equipment	Disinfectant Solution Recommended for COVID-19

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P2002

Diesel particulate filter efficiency below threshold — Bank 1

P0401

Exhaust gas recirculation (EGR) flow insufficient

P20EE

SCR NOx catalyst efficiency below threshold — Bank 1

P0087

Fuel rail / system pressure too low

P0299

Turbocharger / supercharger underboost condition

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN

Decode a VIN to confirm the transmission and build data for a specific RAM 1500, 2500 Pickup. OEM

Build data

Plant, GVWR class, engine and body data for any 17-character VIN.

Recalls

Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Group 65 battery Vehicles taking 5.0 qt DR-platform vehicles Engine oil filter 05281090AB Engine air filter 68441763AA Fuel filter 04798825AD Spark plug 68303918AA

Reference guides

Cross-vehicle references for the kinds of data on this page.

Vehicle recalls & TSBs OBD-II trouble codes Torque specifications Maintenance schedules Fluid capacities & specs

Frequently asked

How much oil does the 2003 RAM 1500, 2500 Pickup 5.9L Diesel take?

5.0 qt of 10W-30 API, per the factory manual.

Does the 2003 RAM 1500, 2500 Pickup have open recalls?

NHTSA lists 9 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the 5.9L Diesel get?

EPA figures are 12 city / 16 highway / 13 combined mpg.