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USA Manufacturer
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Powertrain Engineering Analysis
Ram OBD2 Diagnostic Portal
Ram trucks endure heavy towing and payload cycles. Common trouble codes involve broken exhaust manifold studs causing upstream oxygen sensor lean false readings, Hemi MDS lifter misfires, and transmission solenoid circuit faults.
Primary Engine Families Cataloged
5.7L Hemi V8 with eTorque
3.6L Pentastar V6
6.7L Cummins Turbo Diesel
Commonly Diagnosed Vehicle Models
Ram Ram 1500
Ram Ram 2500
Ram Ram 3500
Ram ProMaster
Ram Factory Service Advisories & Field Notes
P0171 / P0174 Broken Exhaust Manifold Bolts
5.7L Hemi rear exhaust manifold bolts (cylinders 7 and 8) commonly snap off due to thermal expansion. This creates an exhaust leak that draws in fresh oxygen before the upstream O2 sensor, falsely driving fuel trims positive and triggering lean codes.
High-Frequency Ram Trouble Codes
Click any diagnostic trouble code to view in-depth multimeter specs, factory TSBs, and repair workflows:
P0171
High
System Too Lean (Bank 1)
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P0300
Critical
Random or Multiple Cylinder Misfire Detected
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P0455
Low
Evaporative Emission System Leak Detected (Gross Leak / Large Leak)
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P0700
High
Transmission Control System (MIL Request)
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P0128
Low to Moderate
Coolant Thermostat (Coolant Temp Below Regulating Temp)
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P0420
Moderate
Catalyst System Efficiency Below Threshold (Bank 1)
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