MazicBay Diagnostics
MAZICBAYDiagnostics
Lookup DTC
FTC Reader Disclosure: When you purchase or register through links on our site, we may earn an affiliate commission at no extra cost to you. Read our Editorial & Advertising Policy.

P0404 on RAM: Symptoms, Causes & Fix

Exhaust Gas Recirculation (EGR) Circuit Range/Performance

Official technical diagnostic wire for fault code P0404 specifically affecting RAM vehicles (1500, 2500, 3500, TRX).

Sensor Voltage Ref
0.1V – 5.0V Ref
RAM Factory Standard
CAN Bus Speed
500 kbps CAN-FD
ISO 15765-4 Diagnostic Bus
Drivability Status
Not Recommended
Medium urgency level
Est. Repair Cost
$150 - $400 (DIY: $60 - $180)
Parts & Labor DIY
Model-Specific Diagnostic Wires

Select Your RAM Model for P0404:

5 Models Available
RAM 15002020–2026
RAM 1500Truck • 3.0L Hurricane Twin-Turbo I6 (420HP/540HP) / 5.7L HEMI V8 eTorque / 3.6L Pentastar
P0404 Fix & DLC Location
RAM 25002020–2026
RAM 2500Truck • 6.7L Cummins Turbo-Diesel I6 (420HP / 1,075 lb-ft) / 6.4L HEMI V8 (410HP)
P0404 Fix & DLC Location
RAM ProMaster2020–2026
RAM ProMasterVan • 3.6L Pentastar V6 (280HP) / 3.0L EcoDiesel (174HP)
P0404 Fix & DLC Location
RAM 35002020–2026
RAM 3500Truck • 6.7L High-Output Cummins Turbo-Diesel (420HP / 1,075 lb-ft torque / Dual Rear Wheel)
P0404 Fix & DLC Location
RAM 1500 TRX2021–2024
RAM 1500 TRXTruck • 6.2L Supercharged HEMI V8 (702HP / 650 lb-ft / Bilstein Black Hawk e2)
P0404 Fix & DLC Location

1. Common Symptoms on RAM Vehicles

When RAM Engine Control Modules (ECM) trigger fault code P0404, drivers typically report:

Check Engine Light on on RAM Powertrains
Intermittent rough idle on RAM Powertrains
Slight hesitation when cruising on RAM Powertrains
Failed emissions test on RAM Powertrains

2. Root Causes on RAM Engines

Historical diagnostic claims across RAM engines point to the following failure distribution:

55%
Carbon deposits restricting linear EGR pintle movement (RAM OEM Part)
25%
Worn internal EGR position feedback potentiometer (RAM OEM Part)
12%
Wiring harness resistance or corroded connector pin (RAM OEM Part)

3. Step-by-Step Fix Protocol for RAM

01
Check EGR Position PID on Scanner

Compare commanded EGR percentage vs actual position voltage. on RAM engines.

Required Tool: OBD-II Scanner
02
Clean EGR Pintle and Housing

Clean carbon buildup restricting valve stroke. on RAM engines.

Required Tool: Carb Cleaner, Wire Brush
03
Replace Electronic EGR Valve

If potentiometer is worn out, install new OEM electronic EGR valve. on RAM engines.

Required Tool: Socket Set, New Gasket
04
Clear Codes and Road Test

Clear DTCs and complete an EGR monitor drive cycle. on RAM engines.

Required Tool: OBD-II Scanner
Recommended Parts & Testing Tools

Equipment for Diagnosing RAM (P0404)

Prime Fast Delivery & Verified Fitment
Direct-Fit Replacement Part

RAM OEM Replacement Sensor

4.7 / 5.0 (Verified Fit)

Direct-fit replacement assembly engineered to OEM tolerances for RAM.

$45 – $95 Prime
Check Fitment on Amazon
Sensor Signal Voltage Meter

AstroAI Auto-Ranging Digital Multimeter

4.6 / 5.0 (Best Seller)

Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.

$29.99 Prime
View on Amazon
Top Mobile OBD-II Scanner

BlueDriver Bluetooth Pro OBDII Scan Tool

4.7 / 5.0 (50,000+ Reviews)

Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.

Compare OEM & Aftermarket Replacement Sensors for RAMVerified direct-fit pricing from Denso, Bosch, Motorcraft, and ACDelco on Amazon.
Find Parts on Amazon
* As an Amazon Associate, MazicBay earns from qualifying purchases. Prices & availability subject to change.

4. RAM P0404 Frequently Asked Questions

What does code P0404 mean on a RAM?

On RAM vehicles, P0404 indicates that the Engine Control Module (ECM) detected exhaust gas recirculation (egr) circuit range/performance. This typically points to Carbon deposits restricting linear EGR pintle movement or Worn internal EGR position feedback potentiometer.

Can I continue driving my RAM with code P0404?

Yes. Normal drivability is maintained in most conditions. Because this code carries a Medium severity rating on RAM powertrains, we recommend scanning live data values promptly to prevent secondary damage.

How much does it cost to fix code P0404 on a RAM?

Estimated DIY parts cost ranges from $150 - $400 (DIY: $60 - $180), while professional shop repairs at an authorized RAM dealership or independent specialist typically range from $180 to $380 including diagnostic labor.