Exhibit 5.1

Davis Polk & Wardwell llp 450 Lexington Avenue New York, NY 10017 davispolk.com

Ladies and Gentlemen:

We have acted as special New York counsel for Aptiv PLC, a Jersey public limited company (the “Company”), in connection with the Underwriting Agreement dated as of November 9, 2021 (the “Underwriting Agreement”) with you and the other several Underwriters named in Schedule 1 thereto (the “Underwriters”) under which you and such other Underwriters have severally agreed to purchase from the Company $1.5 billion aggregate principal amount of its 3.100% Senior Notes due 2051 (the “Securities”). The Securities are to be issued pursuant to the provisions of the Indenture dated as of March 10, 2015 (as previously amended, supplemented or otherwise modified from time to time, the “Base Indenture”) among the Company, the guarantors party thereto, Deutsche Bank Trust Company Americas, as registrar, paying agent and authenticating agent, and Wilmington Trust, National Association, as trustee (the “Trustee”), as supplemented by the Sixth Supplemental Indenture dated as of November 23, 2021 (the “Sixth Supplemental Indenture” and, together with the Base Indenture, the “Indenture”).

We have examined originals or copies of such documents, corporate records, certificates of public officials and other instruments as we have deemed necessary or advisable for the purpose of rendering this opinion.

We have participated in the preparation of the Company’s registration statement on Form S-3 (File No. 333-258499) (other than the documents incorporated by reference therein (the “Incorporated Documents”)) filed with the Securities and Exchange Commission (the “Commission”) pursuant to the provisions of the Securities Act of 1933, as amended (the “Act”), relating to the registration of securities (the “Shelf Securities”) to be issued from time to time by the Company and the guarantors named therein, and the preliminary prospectus supplement dated November 9, 2021 (the “Preliminary Prospectus Supplement”) relating to the Securities, the pricing term sheet attached as Annex B to the Underwriting Agreement for the Securities and the prospectus supplement dated November 9, 2021 relating to the Securities (the “Prospectus Supplement”), and have reviewed the Incorporated Documents. The registration statement became effective under the Act and the Indenture qualified under the Trust Indenture Act of 1939, as amended (the “Trust Indenture Act”), upon the filing of the registration statement with the Commission on August 5, 2021 pursuant to Rule 462(e). The registration statement at the date of the Underwriting Agreement, including the Incorporated Documents and the information deemed to be part of the registration statement at the time of effectiveness pursuant to Rule 430B under the Act, is hereinafter referred to as the “Registration Statement,” and the related prospectus (including the Incorporated Documents) dated August 5, 2021 relating to the Shelf Securities is hereinafter referred to as the “Basic Prospectus.” The Basic Prospectus, as supplemented by the Preliminary Prospectus Supplement, together with the pricing term sheet attached as Annex B to the Underwriting Agreement for the Securities, is hereinafter referred to as the “Disclosure Package.” The Basic Prospectus, as supplemented by the Prospectus Supplement, in the form first used to confirm sales of the Securities (or in the form first made available by the Company to the Underwriters to meet requests of purchasers of the Securities under Rule 173 under the Act), is hereinafter referred to as the “Prospectus.”

J.P. Morgan Securities LLC Citigroup Global Markets Inc. Goldman Sachs & Co. LLC as Representatives

In rendering the opinions expressed herein, we have, without independent inquiry or investigation, assumed that (i) all documents submitted to us as originals are authentic and complete, (ii) all documents submitted to us as copies conform to authentic, complete originals, (iii) all documents filed with or submitted to the Commission through its Electronic Data Gathering, Analysis and Retrieval (“EDGAR”) system (except for required EDGAR formatting changes) conform to the versions of such documents reviewed by us prior to such formatting, (iv) all signatures on all documents that we reviewed are genuine, (v) all natural persons executing documents had and have the legal capacity to do so, (vi) all statements in certificates of public officials and officers of the Company that we reviewed were and are accurate and (vii) all representations made by the Company as to matters of fact in the documents that we reviewed were and are accurate.

Based upon the foregoing, and subject to the additional assumptions and qualifications set forth below, we are of the opinion that:

J.P. Morgan Securities LLC Citigroup Global Markets Inc. Goldman Sachs & Co. LLC as Representatives

We have considered the statements included in the Disclosure Package and the Prospectus under the captions “Description of Debt Securities and Guarantees of Debt Securities” and “Description of Notes” insofar as they summarize provisions of the Indenture and the Securities. In our opinion, such statements fairly summarize these provisions in all material respects. The statements included in the Disclosure Package and the Prospectus under the caption “Tax Considerations—U.S. Federal Income Tax Considerations,” insofar as they purport to describe provisions of U.S. federal income tax laws or legal conclusions with respect thereto, and subject to the limitations and qualifications set forth therein, accurately summarize the matters referred to therein in all material respects.

In rendering the opinions in paragraphs (1) and (2) above, we have assumed that each party to the Documents has been duly incorporated and is validly existing and in good standing under the laws of the jurisdiction of its organization. In addition, we have assumed that (i) the execution, delivery and performance by each party thereto of each Document to which it is a party, (a) are within its corporate powers, (b) do not contravene, or constitute a default under, the certificate of incorporation or bylaws or other constitutive documents of such party, (c) require no action by or in respect of, or filing with, any governmental body, agency or official and (d) do not contravene, or constitute a default under, any provision of applicable law or regulation or any judgment, injunction, order or decree or any agreement or other instrument binding upon such party and (ii) each Document (other than the Underwriting Agreement) is a valid, binding and enforceable agreement of each party thereto (other than as expressly covered above).

We express no opinion as to whether a New York State or United States federal court would enforce the exclusivity of the jurisdiction of any New York State or United States federal court provided for in any Document.

We are members of the Bar of the State of New York, and the foregoing opinion is limited to the laws of the State of New York, the federal laws of the United States of America and the General Corporation Law of the State of Delaware, except that we express no opinion as to any law, rule or regulation that is applicable to the Company, the Documents or such transactions solely because such law, rule or regulation is part of a regulatory regime applicable to any party to any of the Documents or any of its affiliates due to the specific assets or business of such party or such affiliate. With respect to all matters of law other than those set forth above, you have received, and we understand that you are relying upon, the opinions of local counsel to the Company, delivered pursuant to Section 6(g) of the Underwriting Agreement.

This opinion is rendered solely to you and the other several Underwriters in connection with the Underwriting Agreement. This opinion may not be relied upon by you or the other several Underwriters for any other purpose or relied upon by any other person (including any person acquiring Securities from the several Underwriters) or furnished to any other person without our prior written consent.

Very truly yours,

/s/ Davis Polk & Wardwell LLP

ANNEX A

Schedule of Agreements