2PCS ECM Power Relay 39794-SDA-901 Replaces 39794-SDA-902, Compatible with Honda Accord 2003-2022, CR-V 2007-2022, Odyssey 2005-2022, Pilot 2009-2024, 12V 4-Pin Engine Bay Relay

What it is: ECM/PCM power relay (12V, 4-pin) for engine management power feed. Direct reference: 39794-SDA-901; supersession: 39794-SDA-902.Function & symptoms: Supplies switched battery voltage to the engine control module. Failure may cause no-start, intermittent stall, or ECM power faults (e.g., P0685); verify power and grounds during diagnosis.Typical location: Main fuse/relay box in the engine compartment on many applications; some models use an interior (under-dash) fuse/relay box. Always confirm by VIN/owner’s manual.Fitment highlights (North America): Compatible with Honda Accord (2003–2022), CR-V (2007–2022), Odyssey (2005–2022), Pilot (2009–2024); Compatible with Acura RDX (2007–2024), MDX (2014–2024), TL (2004–2014), TSX (2004–2014). For exact trim/engine coverage, match by VIN.Complementary parts: Pair with fuel pump relay OE 39794-SDA-004 when addressing no-start/fuel-delivery issues from the same fuse/relay box.Notes: This listing references OE numbers for identification. Verify slot position and relay footprint before installation.

• Specs & OE cross-refs — 12V control relay; 4-pin configuration; engine/ECM power function. Cross-reference OE: 39794-SDA-901 (this listing); replaces/superseded by 39794-SDA-902. Typical symptoms of a failing ECM/PCM power relay include no-start, intermittent stall, or ECM power faults (e.g., P0685).
• Install location & service notes — Typically installed in the main fuse/relay box in the engine compartment; some applications may use an interior (under-dash) fuse/relay box. Verify by VIN/owner’s manual before installation. “Included with main fuse box” is noted on OE catalogs for the superseding part. Basic check: swap-test with like relay, or bench-test coil/contacts before replacement.
• Compatible with 2003–2022 Honda Accord (Engine Compartment Fuse/Relay Box ECM Power Relay) — years covered for North America: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022.
• Compatible with 2007–2022 Honda CR-V (Engine Compartment Fuse/Relay Box ECM Power Relay) — years: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022
• Compatible with 2005–2022 Honda Odyssey (Engine Compartment Fuse/Relay Box ECM Power Relay) — years: 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022.
• Compatible with 2009–2024 Honda Pilot (Engine Compartment Fuse/Relay Box ECM Power Relay) — years: 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024
• Compatible with Acura (ECM Power Relay, Fuse/Relay Box) — RDX years: 2007–2024 (list: 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024); MDX years: 2014–2024 (2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024)
• More Acura coverage (ECM Power Relay, Fuse/Relay Box) — TL years: 2004–2014 (2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014); TSX years: 2004–2014 (2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014)
• Complementary items to capture related traffic — Compatible with OE fuel-pump relay 39794-SDA-004 (often serviced from the same fuse/relay box); pairing this ECM power relay with the fuel-pump relay and appropriate fuses can resolve “crank/no start with fuel cut” complaints. Check fuse box diagrams for exact slots.