2023 Chevrolet Silverado 1500 — Fuse Box Diagram & Amperage

Quick answer

• Under-hood fuse/relay block: driver side of engine bay, near the battery. Protects engine management, starter, fuel pump control, lighting, ABS, A/C clutch, trailer power, and high-draw circuits.
• Instrument panel (I/P) fuse block: left end of the dash, behind the side trim panel accessible with the driver’s door open. Protects interior power (cigar/12V), infotainment/radio, HVAC control, airbag/SDM, ignition feeds, and body electronics.
• Rear compartment/cargo fuse block: under the left rear seat bottom cushion (crew/double cab). Protects rear power options, amplifier, sliding rear window, bed/aux power, trailer battery charge/aux circuits (if equipped).

Note: GM varies assignments by trim (WT, LT, RST, LT Trail Boss, ZR2, LTZ, High Country), engine (2.7L, 5.3L, 6.2L, 3.0L Duramax), and RPO options (inverter, trailer package, upfitter). Always confirm against the printed legend on your fuse box lid.

Under-hood fuse/relay block (engine compartment)

Typical circuits and ratings shown below. Numbers/positions may vary by RPO; verify the lid legend.

Relays in this block (verify lid map for positions):

• Starter (CRANK) relay
• A/C compressor clutch relay
• High beam and low beam relays
• Fuel pump/FSCM relay (application dependent)
• Cooling fan relays (if equipped with dual fans)
• Trailer power/park lamp relays (tow package)

Instrument panel fuse block (left dash end panel)

Typical interior circuits shown below. Numbers/positions vary; confirm on the panel backside legend.

Common relays at/near the I/P block (trim-dependent):

• RAP/retained accessory power relay (keeps radio/windows alive briefly after key-off)
• Run/Crank relay (some trims)

Rear compartment/cargo fuse block (under left rear seat)

Applies to crew/double cabs. Lift the left rear seat bottom and remove the access cover.

Relays present here (as equipped):

• Inverter/main power relay for 120V outlet
• Rear defog/cargo lamp relay (model dependent)

Important: The 2023 Silverado 1500 uses option-dependent layouts. Where “See lid” is shown under Fuse #, match the circuit name printed on your specific fuse box legend. GM labels may appear as ECM 1, ECM 2, IGN, HVAC 1, RADIO, AMP, FSCM, ABS PUMP, TRLR PWR, etc.

How to test a fuse

• Visual check: Remove the suspect fuse with a puller and inspect the metal link through the translucent body. If the link is melted or broken, replace the fuse with the same amp rating and color.
• Continuity with a meter: With the fuse removed, test across the two blades with a multimeter set to continuity or ohms; a good fuse reads near 0 Ω.
• Powered back-probing: With the fuse installed and key on, use a test light or meter at the test tabs on top of the fuse. Both tabs should have power; if only the feed side is powered, the fuse is open.
• Load verification: If a replacement fuse pops immediately, stop and diagnose the shorted circuit before upsizing the fuse. Never install a higher-amp fuse than specified.

Common blown fuses on this vehicle (what to check first)

• 12V/Cigar outlets (I/P CIG/ACC, AUX PWR 20A): Coins in the socket or damaged USB/chargers commonly short these. Inspect the socket for debris; verify no aftermarket device is shorted.
• Trailer lighting (TRLR STOP-L/STOP-R/PARK 20–30A): A pinched 7-way harness at the hitch or corroded trailer connector frequently blows these. Unplug the trailer and retest; repair trailer wiring before replacing fuses.
• Headlamps (HDLP LO/HI 10–15A): After bulb replacement, ensure connectors are fully seated and not shorted against ground. Moisture-intrusion in housings is another culprit.
• HVAC blower (BLWR 40A J-case): If it pops, suspect a failing blower motor or debris in the fan. Check the blower resistor/control module for shorts.
• A/C clutch (A/C CLUTCH 10–15A): A shorted clutch coil or chafed harness near the compressor is common.
• ABS (ABS PUMP 40–60A, ABS MOD 25–30A): Intermittent shorts at wheel speed sensor harnesses or pump internal faults can blow these. Scan for ABS codes before parts replacement.
• ECM/INJ (ECM 1/2 10–15A, INJ 20–25A): After under-hood work, look for pinched harness near the intake, coil brackets, or aftermarket add-ons tied into ignition power.

Tip: If your truck differs from the table, it’s normal—GM publishes the authoritative assignment on the lid of each block. Match the circuit name and amp rating to your legend.

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