P0175 on the 2022 Ram 1500: HEMI and Pentastar Diagnosis
The 2022 Ram 1500 is most commonly equipped with the 5.7L HEMI V8 (395 hp with eTorque) or the 3.6L Pentastar V6 (305 hp). Both V-configuration engines have a distinct Bank 2 with dedicated exhaust and O2 sensors. At 2-4 years old with 25,000-60,000 miles, the 2022 Ram 1500 is at the mileage where sensor contamination and early wear begin to trigger fuel system codes like P0175.
P0175 means the ECM has found Bank 2 running too rich. On a full-size truck, this hits your wallet at the fuel pump as well — a HEMI that's already consuming premium quantities of fuel gets even thirstier when running rich.
Symptoms You'll Notice
- Check engine light on
- MPG dropping noticeably — HEMI owners may see 12-14 MPG instead of 17-20
- Rough idle, especially when in drive at a stoplight
- Rich exhaust smell
- Black tailpipe residue
- HEMI may struggle with MDS transitions
- Reduced power under load, especially noticeable when hauling or towing
Root Causes for the 2022 Ram 1500
1. MAF Sensor Contamination — High Likelihood
Trucks are harder on MAF sensors than cars. The Ram 1500's intake draws air through a filter that may be exposed to dust, dirt, and debris from work sites, unpaved roads, and towing environments. After 25,000-60,000 miles, the MAF sensor element has accumulated contamination that degrades its accuracy. The HEMI V8 pulls enormous volumes of air, and even a 5% underreading at high airflow translates to a significant fuel delivery error. The Pentastar V6 is similarly affected but draws less total air volume.
2. O2 Sensor Aging on Bank 2 — Medium Likelihood
The upstream wideband O2 sensor on Bank 2 has been exposed to years of high exhaust temperatures. On the HEMI, the exhaust manifold runs extremely hot, and the sensor is positioned close to these heat sources. A slow-responding sensor gives the ECM outdated mixture data, causing overcorrection with fuel. Comparing Bank 1 and Bank 2 sensor response times reveals if one bank's sensor is degrading faster.
3. Fuel Injector Issues — Medium Likelihood
The HEMI's multi-port injectors fire twice per engine cycle at pressures around 60 PSI. After millions of cycles, injector pintles can wear and seals can degrade. A leaking injector on cylinders 2, 4, 6, or 8 (Bank 2) delivers fuel when it should be sealed. The rich condition is often worse at idle and cold startup. An injector flow test reveals whether any Bank 2 injectors are over-delivering.
4. EVAP Purge Valve Stuck Open — Low Likelihood
The EVAP purge valve on the Ram 1500 can stick open, continuously feeding fuel vapors into the intake. On a large-displacement engine like the HEMI, the effect of purge valve vapor is proportionally smaller than on a 4-cylinder, but it can still push fuel trims beyond the ECM's correction limit. Disconnecting the purge valve hose at idle provides a quick diagnostic test.
Diagnostic Steps
- Scan for all DTCs with a Chrysler/Stellantis-compatible scanner (wiTECH preferred)
- Compare Bank 1 vs Bank 2 fuel trims at idle and 2,000 RPM
- Test MAF sensor output at idle and under load
- Monitor O2 sensor waveforms on Bank 2
- Check fuel pressure at the rail
- Test EVAP purge valve operation
Repair Costs
- MAF sensor: $90–$220
- O2 sensor: $110–$280
- Fuel injector (HEMI, each): $70–$180
- EVAP purge valve: $60–$150
DIY Repair Potential
The Ram 1500's engine bay is one of the more spacious truck layouts. MAF sensor replacement is easy. O2 sensor access depends on the bank — Bank 2 sensors on the HEMI can be tight between the manifold and firewall. HEMI fuel injectors are accessible with fuel rail removal, which is an intermediate-level repair. Use a Chrysler-specific scanner or the alfaOBD app for adaptation resets after repair.