diff --git a/packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts b/packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts
index 53bf6b7fb32fd..4da2094aa8f63 100644
--- a/packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts
+++ b/packages/aws-cdk-lib/aws-ec2/lib/instance-types.ts
@@ -596,6 +596,16 @@ export enum InstanceClass {
    */
   I4I = 'i4i',
 
+  /**
+   * Storage optimized instances powered by Graviton2 processor, 4th generation
+   */
+  STORAGE4_GRAVITON = 'storage4_graviton',
+
+  /**
+   * Storage optimized instances powered by Graviton2 processor, 4th generation
+   */
+  I4G = 'i4g',
+
   /**
    * Storage optimized instances powered by Graviton2 processor, 4th generation
    */
@@ -1291,6 +1301,8 @@ export class InstanceType {
       [InstanceClass.I3]: 'i3',
       [InstanceClass.IO3_DENSE_NVME_DRIVE]: 'i3en',
       [InstanceClass.I3EN]: 'i3en',
+      [InstanceClass.STORAGE4_GRAVITON]: 'i4g',
+      [InstanceClass.I4G]: 'i4g',
       [InstanceClass.STORAGE4_GRAVITON_NETWORK_OPTIMIZED]: 'im4gn',
       [InstanceClass.IM4GN]: 'im4gn',
       [InstanceClass.STORAGE4_GRAVITON_NETWORK_STORAGE_OPTIMIZED]: 'is4gen',
diff --git a/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/aws-sdk/call-aws-service.ts b/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/aws-sdk/call-aws-service.ts
index 5df3508c5c855..b8f18f7593ca6 100644
--- a/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/aws-sdk/call-aws-service.ts
+++ b/packages/aws-cdk-lib/aws-stepfunctions-tasks/lib/aws-sdk/call-aws-service.ts
@@ -79,6 +79,15 @@ export class CallAwsService extends sfn.TaskStateBase {
     if (this.props.integrationPattern === sfn.IntegrationPattern.RUN_JOB) {
       throw new Error('The RUN_JOB integration pattern is not supported for CallAwsService');
     }
+    if (!Token.isUnresolved(this.props.action) && !this.props.action.startsWith(this.props.action[0]?.toLowerCase())) {
+      throw new Error(`action must be camelCase, got: ${this.props.action}`);
+    }
+    if (this.props.parameters) {
+      const invalidKeys = Object.keys(this.props.parameters).filter(key => !key.startsWith(key[0]?.toUpperCase()));
+      if (invalidKeys.length) {
+        throw new Error(`parameter names must be PascalCase, got: ${invalidKeys.join(', ')}`);
+      }
+    }
 
     const iamServiceMap: Record<string, string> = {
       sfn: 'states',
diff --git a/packages/aws-cdk-lib/aws-stepfunctions-tasks/test/aws-sdk/call-aws-service.test.ts b/packages/aws-cdk-lib/aws-stepfunctions-tasks/test/aws-sdk/call-aws-service.test.ts
index e6df2b2b369a8..d0b1b784a1f90 100644
--- a/packages/aws-cdk-lib/aws-stepfunctions-tasks/test/aws-sdk/call-aws-service.test.ts
+++ b/packages/aws-cdk-lib/aws-stepfunctions-tasks/test/aws-sdk/call-aws-service.test.ts
@@ -162,6 +162,30 @@ test('throws with invalid integration pattern', () => {
   })).toThrow(/The RUN_JOB integration pattern is not supported for CallAwsService/);
 });
 
+test('throws if action is not camelCase', () => {
+  expect(() => new tasks.CallAwsService(stack, 'GetObject', {
+    service: 's3',
+    action: 'GetObject',
+    parameters: {
+      Bucket: 'my-bucket',
+      Key: sfn.JsonPath.stringAt('$.key'),
+    },
+    iamResources: ['*'],
+  })).toThrow(/action must be camelCase, got: GetObject/);
+});
+
+test('throws if parameters has keys as not PascalCase', () => {
+  expect(() => new tasks.CallAwsService(stack, 'GetObject', {
+    service: 's3',
+    action: 'getObject',
+    parameters: {
+      bucket: 'my-bucket',
+      key: sfn.JsonPath.stringAt('$.key'),
+    },
+    iamResources: ['*'],
+  })).toThrow(/parameter names must be PascalCase, got: bucket, key/);
+});
+
 test('can pass additional IAM statements', () => {
   // WHEN
   const task = new tasks.CallAwsService(stack, 'DetectLabels', {