When your 2020 Acura TLX displays the P0087 code, the powertrain control module has determined that fuel rail pressure is not reaching commanded levels. The TLX's direct injection system requires precise high-pressure fuel delivery for proper operation.
Acura's Earth Dreams Fuel System
The 2020 TLX with the 2.4L engine uses Honda's Earth Dreams direct injection technology. This system operates at extremely high pressures—up to 200 bar—to inject fuel directly into the combustion chambers. The fuel pump module includes both a low-pressure supply pump and a mechanically-driven high-pressure pump.
Why Fuel Pressure Drops
The high-pressure fuel pump is the most likely failure point. These pumps work hard and the internal cam follower and plunger assembly wears over time. Other possibilities include a clogged fuel filter reducing supply to the high-pressure pump, failing low-pressure pump not maintaining adequate feed pressure, internal fuel rail leakage, or a faulty fuel pressure sensor misreporting actual pressure.
Diagnosis Procedure
Connect a scan tool capable of reading Honda/Acura fuel system data. Monitor commanded versus actual fuel pressure. Perform a relative compression test through cranking fuel pressure analysis if available. Check the fuel filter—if never replaced, restricted flow is likely. Listen for the fuel pumps during key-on priming cycles.
Repair Path
High-pressure pump replacement requires removing the intake manifold for access. The pump is cam-driven, so proper timing alignment is essential during installation. If the low-pressure pump is failing, the entire fuel pump module assembly is typically replaced. Always use genuine Acura parts for fuel system components given the high-pressure requirements.