Understanding P0174 on Your 2024 Volvo XC60
The P0174 diagnostic trouble code on your 2024 Volvo XC60 indicates that bank 2 of the engine is running too lean, meaning there's an imbalance between air and fuel — specifically too much air or insufficient fuel. The 2024 XC60 uses Volvo's updated B5 or B6 mild-hybrid powertrains, both based on the 2.0L four-cylinder engine with a 48-volt integrated starter-generator. These engines feature direct injection and turbocharging (plus supercharging on the B6), all built on the second-generation SPA platform.
Symptoms to Watch For
- Persistent check engine light (MIL) on the instrument cluster
- Rough or uneven idle quality, especially during cold starts
- Noticeable hesitation when accelerating from a stop
- Decreased fuel efficiency below the expected 26–29 mpg combined
- Occasional engine surging or hunting at idle
Most Likely Causes on the 2024 XC60
1. Boost or Vacuum Leak (High Likelihood)
The turbocharged 2.0L engine in your 2024 XC60 relies on a complex network of charge pipes, intercooler connections, and vacuum lines. Even on a relatively new vehicle, a loose clamp, cracked silicone coupler, or a pinched vacuum line from factory assembly can introduce unmetered air. The mild-hybrid system's stop-start functionality can also stress connections through thermal cycling. A professional smoke test is the most effective way to identify these leaks.
2. MAF Sensor Issues (Medium Likelihood)
The mass airflow sensor measures incoming air volume to help the ECM calculate fuel delivery. On Volvo's turbocharged engines, oil mist from the crankcase ventilation system can coat the MAF sensor element, causing inaccurate readings. An underreporting MAF leads to insufficient fuel injection, creating the lean condition. Since your 2024 XC60 is newer, contamination is less likely but not impossible — especially if aftermarket air filters or catch cans have been installed.
3. Fuel System Pressure Drop (Medium Likelihood)
The direct injection system on the B5/B6 engines operates at pressures exceeding 200 bar. If the high-pressure fuel pump (HPFP) isn't maintaining adequate rail pressure, the injectors can't deliver enough fuel. On a 2024 model, a defective HPFP would likely be covered under Volvo's powertrain warranty. Low-pressure fuel supply issues from a weak in-tank pump are also possible but rarer on new vehicles.
4. Intake Manifold or Gasket Leak (Low Likelihood)
The composite intake manifold on Volvo's 2.0L engines is generally durable, but a manufacturing defect or gasket flaw could allow unmetered air to enter the intake. On a 2024 model, this would be uncommon and would almost certainly be covered under warranty.
Diagnosis Process
- Pull freeze frame data — Examine engine RPM, load, and coolant temperature at the time the code set to understand the conditions.
- Check fuel trims — Monitor both short-term and long-term fuel trims on bank 2. Consistent LTFT readings above +10% confirm a lean condition.
- Smoke test the intake system — Pressurize the intake tract to find any air leaks in the charge piping, intercooler, or vacuum lines.
- Inspect MAF sensor — Remove and check for contamination. Clean with MAF-specific cleaner if needed.
- Monitor fuel rail pressure — Use a Volvo-compatible scan tool to verify high-pressure fuel pump performance under load.
Repair Cost Estimates
Since the 2024 XC60 is a luxury vehicle and likely still under warranty, many of these repairs may be covered. Out-of-warranty estimates include:
- Boost/vacuum leak repair: $150–$600 depending on the failed component
- MAF sensor replacement: $220–$450 with OEM Volvo parts
- High-pressure fuel pump: $700–$1,300 including labor
- Intake manifold gasket: $450–$850 at a qualified shop
Warranty Considerations
Your 2024 Volvo XC60 should still be covered under Volvo's 4-year/50,000-mile bumper-to-bumper warranty. The P0174 code relates to emissions and fuel system components, which are also covered under the federal emissions warranty (8 years/80,000 miles for major components). Contact your Volvo dealer to determine coverage before paying out of pocket.
Should You Drive With This Code?
A lean condition isn't an emergency, but it shouldn't be ignored. Running lean increases combustion temperatures and can accelerate wear on the catalytic converter. Since your 2024 XC60 is likely under warranty, schedule a dealer appointment promptly. Avoid sustained high-speed driving or heavy towing until the issue is resolved.