P2187 on Honda Passport
Factory diagnostic protocol and troubleshooting wire for fault code P2187 specifically for the Honda Passport (2020–2026, 3.5L i-VTEC V6 (280HP / AWD TrailSport)).
1. Symptoms of P2187 on Honda Passport
When the Engine Control Module (ECM/PCM) on your Honda Passport (3.5L i-VTEC V6 (280HP / AWD TrailSport)) logs fault code P2187, drivers commonly observe:
2. Most Likely Causes on Honda Passport
Historical warranty claims and technical repair bulletins for Honda Passport point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Honda Passport
Check STFT and LTFT. If trims are +20% at idle and drop to +3% at 2,500 RPM, a vacuum leak is 100% confirmed. on the Honda Passport equipped with 3.5L i-VTEC V6 (280HP / AWD TrailSport).
Try to remove oil filler cap while engine idles. If cap is held down with strong vacuum suction and engine whines, the PCV diaphragm is ruptured. on the Honda Passport equipped with 3.5L i-VTEC V6 (280HP / AWD TrailSport).
Connect smoke machine to intake to identify leaking PCV hoses, manifold gaskets, or brake booster lines. on the Honda Passport equipped with 3.5L i-VTEC V6 (280HP / AWD TrailSport).
Install a new OEM PCV oil separator assembly or replace cracked vacuum hoses. on the Honda Passport equipped with 3.5L i-VTEC V6 (280HP / AWD TrailSport).
Clear DTCs and verify fuel trims return to ±5% at idle. on the Honda Passport equipped with 3.5L i-VTEC V6 (280HP / AWD TrailSport).
Equipment for Diagnosing Honda Passport (P2187)
Honda Passport OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Honda Passport.
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 Honda Passport
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Honda Passport:
4. Honda Passport P2187 FAQs
What causes code P2187 to trigger on a Honda Passport?
On the Honda Passport (3.5L i-VTEC V6 (280HP / AWD TrailSport)), P2187 is most frequently caused by Torn diaphragm in PCV valve / oil separator (common on VW/Audi 2.0T) or Intake manifold gasket or vacuum hose leak.
Where is the OBD-II port located on my Honda Passport?
On the Honda Passport, the 16-pin DLC diagnostic connector is located Lower driver steering column trim. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Honda Passport with code P2187?
Yes, for moderate driving. Fix promptly to prevent unmetered air from causing lean idle misfires. Given that P2187 carries a Medium severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.