diff --git a/builder/builder.go b/builder/builder.go
index 44201bcdeb..acfe6823d9 100644
--- a/builder/builder.go
+++ b/builder/builder.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"os"
 	_ "os"
 	"sync"
 	"time"
@@ -324,6 +325,13 @@ func (b *Builder) submitCapellaBlock(block *types.Block, blockValue *big.Int, or
 			log.Error("could not validate block for capella", "err", err)
 		}
 	} else {
+		start := time.Now()
+		err = b.validator.ValidateBuilderSubmissionV2(&blockvalidation.BuilderBlockValidationRequestV2{SubmitBlockRequest: blockSubmitReq, RegisteredGasLimit: vd.GasLimit})
+		if err != nil {
+			log.Error("could not validate block for capella", "err", err, "duration", time.Since(start).String())
+			os.Exit(1)
+		}
+
 		go b.ds.ConsumeBuiltBlock(block, blockValue, ordersClosedAt, sealedAt, commitedBundles, allBundles, usedSbundles, &blockBidMsg)
 		err = b.relay.SubmitBlockCapella(&blockSubmitReq, vd)
 		if err != nil {
diff --git a/builder/service.go b/builder/service.go
index 55f4300c67..7cd777ded5 100644
--- a/builder/service.go
+++ b/builder/service.go
@@ -206,7 +206,7 @@ func Register(stack *node.Node, backend *eth.Ethereum, cfg *Config) error {
 	}
 
 	var validator *blockvalidation.BlockValidationAPI
-	if cfg.DryRun {
+	if cfg.DryRun || !cfg.DryRun {
 		var accessVerifier *blockvalidation.AccessVerifier
 		if cfg.ValidationBlocklist != "" {
 			accessVerifier, err = blockvalidation.NewAccessVerifierFromFile(cfg.ValidationBlocklist)
diff --git a/builder/utils.go b/builder/utils.go
index 284285cf4e..0871ce73a6 100644
--- a/builder/utils.go
+++ b/builder/utils.go
@@ -7,12 +7,20 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"github.com/ethereum/go-ethereum/log"
 	"io"
 	"net/http"
 )
 
 var errHTTPErrorResponse = errors.New("HTTP error response")
 
+type JSONRPCResponse struct {
+	ID      interface{}     `json:"id"`
+	Result  json.RawMessage `json:"result,omitempty"`
+	Error   json.RawMessage `json:"error,omitempty"`
+	Version string          `json:"jsonrpc"`
+}
+
 // SendSSZRequest is a request to send SSZ data to a remote relay.
 func SendSSZRequest(ctx context.Context, client http.Client, method, url string, payload []byte, useGzip bool) (code int, err error) {
 	var req *http.Request
@@ -55,11 +63,21 @@ func SendSSZRequest(ctx context.Context, client http.Client, method, url string,
 	}
 	defer resp.Body.Close()
 
+	bodyBytes, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return resp.StatusCode, fmt.Errorf("could not read error response body for status code %d: %w", resp.StatusCode, err)
+	}
+
+	res := new(JSONRPCResponse)
+	if err := json.Unmarshal(bodyBytes, &res); err != nil {
+		return resp.StatusCode, fmt.Errorf("could not unmarshal error response body for status code %d: %w", resp.StatusCode, err)
+	}
+
+	if res.Error != nil {
+		log.Info("Error response", "code", resp.StatusCode, "message", string(res.Error))
+	}
+
 	if resp.StatusCode > 299 {
-		bodyBytes, err := io.ReadAll(resp.Body)
-		if err != nil {
-			return resp.StatusCode, fmt.Errorf("could not read error response body for status code %d: %w", resp.StatusCode, err)
-		}
 		return resp.StatusCode, fmt.Errorf("HTTP error response: %d / %s", resp.StatusCode, string(bodyBytes))
 	}
 	return resp.StatusCode, nil