31 Electrical connector parts are listed for the 2021 Nissan Frontier, in 12 part types, covering all 3 engine options (2.5L L4, 2.5L L4 DIESEL Turbocharged and 3.8L V6). Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 Nissan Frontier, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. Most of the listed parts are Trailer Connector (14 parts), Blower Motor Control Module / Resistor Connector (4 parts) and A/C Refrigerant Pressure Switch Connector (2 parts). The other 9 part types cover the remaining 11 parts.
The 2021 Nissan Frontier was sold with 3 engines. 30 parts fit every engine; the other 1 is engine-specific. Each part shows which engine(s) it fits.
6 brands supply electrical connector parts for the 2021 Nissan Frontier, led by CURT (18 parts), STANDARD MOTOR PRODUCTS (9 parts) and UNITED MOTOR PRODUCTS (1 part), plus 3 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Nissan Frontier. 3 parts have it, including CURT 55415 (Trailer Connector) and CURT 56415 (Trailer Connector). Each part number opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | S2458 | 🇺🇸 US 🇲🇽 MX | Connector Shape: OvalWire Gauge (GA): 18, 20 | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: all 2021 Frontier engines | CON205 | 🇺🇸 US 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the A/C Refrigerant Pressure Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
2 A/C Refrigerant Pressure Switch Connector parts are listed for the 2021 Nissan Frontier, from STANDARD MOTOR PRODUCTS and UNITED MOTOR PRODUCTS. All of them fit every engine offered in the 2021 Frontier.
Listed part numbers: STANDARD MOTOR PRODUCTS S2458 and UNITED MOTOR PRODUCTS CON205.
Accelerator Pedal Position Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | S1048 | 🇺🇸 US 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Accelerator Pedal Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS S1048.
Blower Motor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | S3027 | 🇺🇸 US 🇲🇽 MX | View on Amazon |
This table covers the harness connectors at the Blower Motor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS S3027.
Blower Motor Control Module / Resistor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: 3.8L V6 | 1712341 | 🇺🇸 US | Blower Motor Resistor Pigtail | View on Amazon |
| HOLSTEIN Fits: all 2021 Frontier engines | 2HAR0008 | 🇺🇸 US 🇲🇽 MX | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | S1763 | 🇺🇸 US 🇲🇽 MX | Connector Shape: OvalWiring Harness Length (mm): 311.15 | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | S1763HT | 🇺🇸 US 🇲🇽 MX | Blue Streak | View on Amazon |
This table covers the connectors at the blower resistor or control module. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
4 Blower Motor Control Module / Resistor Connector parts are listed for the 2021 Nissan Frontier, from STANDARD MOTOR PRODUCTS, GPD and HOLSTEIN. 3 parts fit every engine; the other 1 is engine-specific.
This group includes GPD 1712341, HOLSTEIN 2HAR0008 and STANDARD MOTOR PRODUCTS S1763 and the remaining parts above.
Brake Light Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | HP4145 | 🇺🇸 US 🇲🇽 MX | HandypackConnector Shape: Rectangle | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | S1519 | 🇺🇸 US 🇲🇽 MX | Connector Shape: RectangleContact Terminal Material: Metal | View on Amazon |
This table covers the harness connectors at the Brake Light Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
STANDARD MOTOR PRODUCTS supplies both parts for the 2021 Nissan Frontier. All of them fit every engine offered in the 2021 Frontier.
Part numbers include STANDARD MOTOR PRODUCTS HP4145 and STANDARD MOTOR PRODUCTS S1519.
Door Lock Actuator Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | S973 | 🇺🇸 US 🇲🇽 MX | Connector Shape: Square | View on Amazon |
This table covers the harness connectors at the Door Lock Actuator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS S973.
Parking Aid Sensor Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | S2393 | 🇺🇸 US 🇲🇽 MX | Connector Shape: Oval | View on Amazon |
This table covers the harness connectors at the Parking Aid Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS S2393.
Radio Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| METRA Fits: all 2021 Frontier engines | AXBUCHNS | 🇺🇸 US 🇲🇽 MX | Radio Add-On CAM Wiring Harness | View on Amazon |
This table covers the harness connectors at the Radio. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 2021 Nissan Frontier — METRA AXBUCHNS.
Trailer Adapter Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT Fits: all 2021 Frontier engines | 57101 | 🇺🇸 US 🇲🇽 MX | 7-Way Round RV To 4-Way Flat Adapter | View on Amazon |
This table covers the harness connectors at the Trailer Adapter. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: CURT 57101.
Trailer Brake Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT Fits: all 2021 Frontier engines | 51382 | 🇺🇸 US 🇲🇽 MX | Brake Control Adapter HarnessIncludes OEM Connector, 2 ft. Wire, Protective Sleeve, and 12 Gauge Wire | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 51383 | 🇺🇸 US 🇲🇽 MX | Brake Control Adapter HarnessIncludes OEM Connector, 2 ft. Wire, Protective Sleeve, and 12 Gauge Wire | View on Amazon |
This table covers the harness connectors at the Trailer Brake Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
2 Trailer Brake Switch Connector parts for the 2021 Nissan Frontier come from CURT. Every part fits all 3 engine options (2.5L L4, 2.5L L4 DIESEL Turbocharged and 3.8L V6).
Listed part numbers: CURT 51382 and CURT 51383.
Trailer Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT Popular Fits: all 2021 Frontier engines | 55415 | 🇺🇸 US 🇲🇽 MX | Replacement 7-Way RV Blade OEM Socket | View on Amazon |
| CURT Popular Fits: all 2021 Frontier engines | 56415 | 🇺🇸 US 🇲🇽 MX | Replacement 7-Way RV Blade OEM SocketTwist-In | View on Amazon |
| CURT Popular Fits: all 2021 Frontier engines | 56229 | 🇺🇸 US 🇲🇽 MX | 7-Way USCAR Electrical ConnectorLength: 24 in. | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 55416 | 🇺🇸 US 🇲🇽 MX | Heavy Duty Replacement OEM 7-Way RV Blade SocketPlugs Into USCAR Socket | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 55515 | 🇺🇸 US 🇲🇽 MX | Custom Wiring ConnectorOE 4-Way Flat | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 55441 | 🇺🇸 US 🇲🇽 MX | Custom Wiring Connector4-Way Flat | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 56515 | 🇺🇸 US 🇲🇽 MX | Custom Wiring Connector5-Way Flat | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 57015 | 🇺🇸 US 🇲🇽 MX | OEM Replacement Dual-Output 7 and 4 Way ConnectorPlugs Into USCAR Socket | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 55384 | 🇺🇸 US 🇲🇽 MX | Custom Wiring Connector4-Way Flat | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 57020 | 🇺🇸 US 🇲🇽 MX | OEM Replacement Dual-Output 7 and 4 Way ConnectorPackaged | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 55774 | 🇺🇸 US 🇲🇽 MX | OEM Vehicle to Trailer Connector with Harness7-Way and 4-Way | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 56584 | 🇺🇸 US 🇲🇽 MX | Custom Wiring Harness5-Way Flat | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 56225 | 🇺🇸 US 🇲🇽 MX | Custom Wiring Connector4-Way Flat | View on Amazon |
| CURT Fits: all 2021 Frontier engines | 56226 | 🇺🇸 US 🇲🇽 MX | Custom Wiring Connector | View on Amazon |
This table covers the trailer-lighting connectors at the hitch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
CURT supplies the 14 Trailer Connector parts for the 2021 Nissan Frontier. CURT 55415 carries the "Popular" badge. All of them fit every engine offered in the 2021 Frontier.
Trailer Extension Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CURT Fits: all 2021 Frontier engines | 56475 | 🇺🇸 US 🇲🇽 MX | Custom Wiring Harness Extension | View on Amazon |
This table covers the harness connectors at the Trailer Extension. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: CURT 56475.
Buying Electrical Connector Parts for a 2021 Nissan Frontier
On this vehicle, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules.
- Match the engine first. Some electrical connector parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Trailer Connector and Blower Motor Control Module / Resistor Connector .
Frequently Asked Questions
How many electrical connector parts fit the 2021 Nissan Frontier?
Our catalog currently lists 31 electrical connector parts for the 2021 Nissan Frontier across 12 subcategories and 6 brands, covering all 3 engine options (2.5L L4, 2.5L L4 DIESEL Turbocharged and 3.8L V6). Each part is matched to the engine(s) it fits.
Do electrical connector parts differ between 2021 Nissan Frontier engines?
Some do. 30 parts fit every engine; the other 1 is engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical connector problems on a 2021 Nissan Frontier?
Common symptoms include intermittent faults that move when the harness is wiggled, green corrosion inside a plug, or melted connector housings near heat sources. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Nissan Frontier was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Nissan Frontier?
First match the engine — each row shows which engine(s) the part fits. Then match the connector by terminal count and keyway, not just appearance — many families look identical but will not lock. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Nissan Frontier
Electrical Connector Parts for Other Nissan Frontier Years
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