U0104 on RAM ProMaster
Factory diagnostic protocol and troubleshooting wire for fault code U0104 specifically for the RAM ProMaster (2020–2026, 3.6L Pentastar V6 (280HP) / 3.0L EcoDiesel (174HP)).
1. Symptoms of U0104 on RAM ProMaster
When the Engine Control Module (ECM/PCM) on your RAM ProMaster (3.6L Pentastar V6 (280HP) / 3.0L EcoDiesel (174HP)) logs fault code U0104, drivers commonly observe:
2. Most Likely Causes on RAM ProMaster
Historical warranty claims and technical repair bulletins for RAM ProMaster point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for RAM ProMaster
Clean snow, ice, mud, or dead bugs off front radar emblem. on the RAM ProMaster equipped with 3.6L Pentastar V6 (280HP) / 3.0L EcoDiesel (174HP).
Verify power feed to radar sensor. on the RAM ProMaster equipped with 3.6L Pentastar V6 (280HP) / 3.0L EcoDiesel (174HP).
Execute optical/radar alignment procedure if bumper was removed. on the RAM ProMaster equipped with 3.6L Pentastar V6 (280HP) / 3.0L EcoDiesel (174HP).
Clear DTCs and test cruise on highway. on the RAM ProMaster equipped with 3.6L Pentastar V6 (280HP) / 3.0L EcoDiesel (174HP).
Equipment for Diagnosing RAM ProMaster (U0104)
RAM ProMaster OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for RAM ProMaster.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
Other Common Fault Codes on RAM ProMaster
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the RAM ProMaster:
4. RAM ProMaster U0104 FAQs
What causes code U0104 to trigger on a RAM ProMaster?
On the RAM ProMaster (3.6L Pentastar V6 (280HP) / 3.0L EcoDiesel (174HP)), U0104 is most frequently caused by Blocked or dirty front radar sensor in grille/bumper or Blown radar module fuse.
Where is the OBD-II port located on my RAM ProMaster?
On the RAM ProMaster, the 16-pin DLC diagnostic connector is located Driver side lower dash panel near hood release. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my RAM ProMaster with code U0104?
Yes. Normal driving is unaffected, but Adaptive Cruise Control will not engage. Given that U0104 carries a Low severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.