The answer is that the CodePipeline service role lacks the required IAM permissions for the deploy action. This is the most likely cause because CodePipeline uses its own service role to make API calls to the target deployment provider, such as ECS, S3, or Elastic Beanstalk. When CloudTrail logs show the service role itself generating the "Access Denied" error, it confirms the role’s policy is missing specific actions like `codedeploy:CreateDeployment`, `s3:PutObject`, or `ecs:UpdateService`. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how CodePipeline delegates actions through its service role, not through user or resource-based policies. A common trap is assuming the application or build project role is at fault, but the pipeline’s own role is the one making the deploy-stage calls. Remember the memory tip: "Pipeline role, not target role" — if the error says the service role is denied, fix the pipeline’s IAM policy, not the target resource’s.
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses AWS CodePipeline with CodeBuild to test and deploy a web application. The pipeline has been failing at the deploy stage with an error: 'Access Denied'. CloudTrail shows the CodePipeline service role is making the call. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The CodePipeline service role lacks permissions for the deploy action.
The error 'Access Denied' in the deploy stage, with CloudTrail showing the CodePipeline service role making the call, indicates that the IAM role assumed by CodePipeline does not have the necessary permissions to perform the deploy action against the target provider (e.g., ECS, S3, Elastic Beanstalk). CodePipeline uses its service role to invoke the deploy action, and if that role lacks the required `codedeploy:*`, `s3:PutObject`, or `ecs:UpdateService` permissions, the API call will be denied.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The CodeBuild project does not have internet access.
Why it's wrong here
No internet access would cause build failures, not deploy.
✓
The CodePipeline service role lacks permissions for the deploy action.
Why this is correct
The service role must have permissions to perform the deploy action on the target resource.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The deploy provider (e.g., ECS, S3) is not in the same AWS region.
Why it's wrong here
Cross-region pipelines are possible and would not cause Access Denied if permissions are correct.
✗
The source code repository does not have the correct branch.
Why it's wrong here
Wrong branch would cause source stage issues, not deploy stage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the CodeBuild service role with the CodePipeline service role, assuming the build role is responsible for deployment, when in fact CodePipeline uses its own role for the deploy action.
Detailed technical explanation
How to think about this question
CodePipeline's service role must have an IAM policy that grants `sts:AssumeRole` on the deploy provider's cross-account role (if cross-account) or direct action permissions like `s3:PutObject` on the deploy bucket. Under the hood, CodePipeline calls the deploy provider's API (e.g., `UpdateService` for ECS) using its own service role; if the role's trust policy or resource-based policy (e.g., S3 bucket policy) denies the action, the call fails with AccessDenied. A real-world scenario is forgetting to add `codedeploy:CreateDeployment` to the pipeline role when deploying to CodeDeploy.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The CodePipeline service role lacks permissions for the deploy action. — The error 'Access Denied' in the deploy stage, with CloudTrail showing the CodePipeline service role making the call, indicates that the IAM role assumed by CodePipeline does not have the necessary permissions to perform the deploy action against the target provider (e.g., ECS, S3, Elastic Beanstalk). CodePipeline uses its service role to invoke the deploy action, and if that role lacks the required `codedeploy:*`, `s3:PutObject`, or `ecs:UpdateService` permissions, the API call will be denied.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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