P0125 on Acura TLX
Factory diagnostic protocol and troubleshooting wire for fault code P0125 specifically for the Acura TLX (2021–2026, 2.0L Turbo (272HP) / Type S 3.0L Turbo V6 (355HP SH-AWD)).
1. Symptoms of P0125 on Acura TLX
When the Engine Control Module (ECM/PCM) on your Acura TLX (2.0L Turbo (272HP) / Type S 3.0L Turbo V6 (355HP SH-AWD)) logs fault code P0125, drivers commonly observe:
2. Most Likely Causes on Acura TLX
Historical warranty claims and technical repair bulletins for Acura TLX point to the following failure distribution:
3. Step-by-Step DIY Repair Guide for Acura TLX
Check that engine coolant is at full mark and no external radiator or hose leaks exist. on the Acura TLX equipped with 2.0L Turbo (272HP) / Type S 3.0L Turbo V6 (355HP SH-AWD).
Start cold engine and watch ECT climb. If it plateaus below 170°F (77°C) while driving, thermostat is stuck open. on the Acura TLX equipped with 2.0L Turbo (272HP) / Type S 3.0L Turbo V6 (355HP SH-AWD).
Drain 1 gallon of coolant, remove thermostat housing bolts, install new OEM temperature-rated thermostat (typically 180°F–195°F) with jiggle valve at 12 o'clock. on the Acura TLX equipped with 2.0L Turbo (272HP) / Type S 3.0L Turbo V6 (355HP SH-AWD).
Fill cooling system with 50/50 prediluted coolant, run engine with spill-free funnel to purge air bubbles. on the Acura TLX equipped with 2.0L Turbo (272HP) / Type S 3.0L Turbo V6 (355HP SH-AWD).
Verify scan tool Fuel System Status changes from 'Open Loop' to 'Closed Loop' within 5 minutes. on the Acura TLX equipped with 2.0L Turbo (272HP) / Type S 3.0L Turbo V6 (355HP SH-AWD).
Equipment for Diagnosing Acura TLX (P0125)
OEM Thermostat & Gasket Assembly
Direct-replacement thermostat calibrated to factory operating temperature for Acura TLX.
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 Acura TLX
Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Acura TLX:
4. Acura TLX P0125 FAQs
What causes code P0125 to trigger on a Acura TLX?
On the Acura TLX (2.0L Turbo (272HP) / Type S 3.0L Turbo V6 (355HP SH-AWD)), P0125 is most frequently caused by Thermostat stuck open or opening prematurely or Low engine coolant level / air pocket around ECT sensor.
Where is the OBD-II port located on my Acura TLX?
On the Acura TLX, the 16-pin DLC diagnostic connector is located Driver footwell below steering column. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.
Can I safely drive my Acura TLX with code P0125?
Yes, for short distances. Fuel economy will drop 15–25% as the engine remains trapped in open-loop enrichment. Given that P0125 carries a Medium severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.