How to Choose the PPAP Submission Level (1 to 5)? —— Three Criteria for Level Selection, Pass on the First Submission

I. Introduction: The Same Part, Two Different Treatments from Two Suppliers

A new project trial production at a certain original equipment manufacturer (OEM) has concluded, and two suppliers simultaneously submitted PPAP. Supplier A submitted according to the default level 3, filling three boxes with documents for 18 elements. The result was that the customer's Supplier Quality Engineer (SQE) only flipped through the Part Submission Warrant (PSW) and the full-size report before sending it back: "Level 3 does not require submitting a copy of the control plan. Why did you send the entire set?" Supplier B, on the other hand, called to confirm the level before submission and submitted according to level 2, only providing the PSW, appearance approval report, and samples. They received approval within a week.

For the same part, the difference lies not in the amount of documentation but in the correct selection of the submission level. The five PPAP submission levels (1 to 5) specify what the supplier must submit and what the customer will review. Choosing the wrong level can either result in redundant documentation slowing down approval or missing elements leading to direct rejection. Accurate level selection ensures a one-time pass; vague selection can lead to weeks of back-and-forth for additional documents.

II. What Each Level Requires

The PPAP manual divides submissions into five levels, with the core difference being the amount of content submitted:

Level 3 is the default level specified in the manual and should be followed if the customer does not specify otherwise. Level 5 is the most stringent, requiring all documents and an on-site process confirmation by the customer. Additionally, note that appearance parts generally require an appearance approval report (AAR) to be submitted alongside the corresponding level, as it is not exclusive to any specific level. Missing the AAR can still result in the rejection of appearance parts.

III. Level Selection Based on Three Criteria

The level is not determined by guesswork or the assumption that higher is always better. Instead, it should be based on the following three criteria:

Criterion One: Review Customer Requirements. The customer's purchase contract, quality agreement, or SQE emails usually specify the submission level. If specified, follow it strictly. If not specified, default to level 3 and confirm via email, keeping a record of the confirmation. Verbal agreements do not count; they must be in writing.

Criterion Two: Assess Part Risk. For safety parts, parts with multiple special characteristics, or parts using new processes and materials, consider a higher level (3 or 4). For mature parts or parts with minor changes, you can lower the level to 2 if the customer agrees. Setting a low level for high-risk parts is counterproductive and shifts the responsibility to the customer.

Criterion Three: Evaluate Supplier Performance. The customer's supplier rating directly impacts the level. High-performing, long-term suppliers may have their levels relaxed by the customer. New suppliers or those with recent customer complaints are often required to submit at level 4 or even 5. This is not a punishment but a way to rebuild trust through deeper submission.

After determining the level, two additional steps are necessary: First, write the level into the PPAP submission plan, clearly assigning responsibility and completion times for each element. Second, before submission, conduct a self-inspection against the element checklist for the selected level, ensuring all required elements are included to avoid rejection by the customer.

The entire process can be condensed into four steps: Step 1, check the customer's written requirements and default to level 3 if not specified, confirming via email; Step 2, assess part risk, defaulting to a higher level for safety parts, special characteristic parts, and new process parts; Step 3, compare supplier performance and historical submission records to determine the final level and record it in the submission plan; Step 4, prepare all required documents according to the level's element checklist, conduct a self-inspection, and then submit. Following these four steps ensures that the level is almost always correctly chosen.

IV. Three Common Misconceptions

Misconception One: Higher Level Means More Security. Some believe that more documentation is always better and submit at level 3 or even 5 by default. This results in redundant files, extended review times, and the customer questioning why additional documents were submitted. The essence of the level is an agreement; over-submitting is not a sign of diligence but of not understanding the requirements.

Misconception Two: Level 2 Means Less Work. Level 2 only requires fewer documents, not less work. Elements such as the control plan, FMEA, and process capability studies must be completed and done well, regardless of the level. Only the portion submitted to the customer differs. You can submit fewer documents, but you cannot do less work.

Misconception Three: PSW Can Be Filled Casually. The PSW is a core document required at all five levels. Any discrepancy in the signature section, date, part number, or engineering change level can invalidate the entire submission. One supplier, for example, submitted a PSW with a missing digit in the part number, causing a two-week delay because it did not match in the customer's system.

V. In Conclusion

Returning to the two suppliers at the beginning: Supplier B institutionalized the level selection method into a process, confirming the level and preparing the elements according to the checklist before each submission. They have passed on the first submission for three consecutive projects. Supplier A, however, treats the default level 3 as a universal solution and continues to oscillate between "submitting too much" and "missing elements."

The PPAP submission level is not a procedural burden but a contract between the supplier and the customer regarding "what to submit and what to review." Understanding the levels, selecting based on risk, and ensuring all elements are solid will transform your PPAP from a process of "repeated resubmissions" to a "one-time pass."

The PPAP submission level is a contract about "what to submit and what to review." Select the level based on customer requirements, part risk, and supplier performance to pass on the first submission.

Knowledge code: 8.3.3

Version: v20260813

Author: Quality Think Tank Quality Think Tank is dedicated to providing systematic professional knowledge, methodologies, and practical tools to quality management practitioners, helping companies continuously improve their quality capabilities.