diff --git a/cmd/device-definitions-api/bulk_update_powertrain.go b/cmd/device-definitions-api/bulk_update_powertrain.go
new file mode 100644
index 00000000..cb4bd951
--- /dev/null
+++ b/cmd/device-definitions-api/bulk_update_powertrain.go
@@ -0,0 +1,134 @@
+package main
+
+import (
+	"context"
+	"encoding/csv"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/DIMO-Network/device-definitions-api/internal/contracts"
+	"github.com/DIMO-Network/device-definitions-api/internal/core/common"
+	"github.com/DIMO-Network/device-definitions-api/internal/core/models"
+	"github.com/DIMO-Network/device-definitions-api/internal/infrastructure/gateways"
+	"github.com/DIMO-Network/device-definitions-api/internal/infrastructure/sender"
+	"github.com/ethereum/go-ethereum/ethclient"
+
+	"github.com/DIMO-Network/device-definitions-api/internal/config"
+	"github.com/DIMO-Network/shared/pkg/db"
+	"github.com/google/subcommands"
+	"github.com/rs/zerolog"
+)
+
+type bulkUpdatePowertrain struct {
+	logger   zerolog.Logger
+	settings config.Settings
+
+	sender sender.Sender
+}
+
+func (*bulkUpdatePowertrain) Name() string { return "bulk-update-powertrain" }
+func (*bulkUpdatePowertrain) Synopsis() string {
+	return "updates definitions from csv file with corresponding definitionId,powertrain pair per row"
+}
+func (*bulkUpdatePowertrain) Usage() string {
+	return `bulk-update-powertrain <filename csv>`
+}
+
+func (p *bulkUpdatePowertrain) SetFlags(_ *flag.FlagSet) {
+}
+
+func (p *bulkUpdatePowertrain) Execute(ctx context.Context, _ *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
+	filename := ""
+	for _, arg := range os.Args {
+		if strings.Contains(arg, ".csv") {
+			filename = arg
+		}
+	}
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Printf("Error opening file: %v\n", err)
+		return subcommands.ExitFailure
+	}
+	defer file.Close()
+
+	reader := csv.NewReader(file)
+
+	records, err := reader.ReadAll()
+	if err != nil {
+		fmt.Printf("Error reading CSV: %v\n", err)
+		return subcommands.ExitFailure
+	}
+
+	pdb := db.NewDbConnectionFromSettings(ctx, &p.settings.DB, true)
+	pdb.WaitForDB(p.logger)
+
+	ethClient, err := ethclient.Dial(p.settings.EthereumRPCURL.String())
+	if err != nil {
+		p.logger.Fatal().Err(err).Msg("Failed to create Ethereum client.")
+	}
+
+	chainID, err := ethClient.ChainID(ctx)
+	if err != nil {
+		p.logger.Fatal().Err(err).Msg("Couldn't retrieve chain id.")
+	}
+	onChainSvc := gateways.NewDeviceDefinitionOnChainService(&p.settings, &p.logger, ethClient, chainID, p.sender, pdb.DBS)
+
+	for i, record := range records {
+		if len(record) < 2 {
+			fmt.Printf("Skipping malformed line %d: %v\n", i+1, record)
+			continue
+		}
+		definitionID := record[0]
+		powertrain := record[1]
+		if definitionID == "" || powertrain == "" {
+			fmt.Printf("Skipping malformed line %d: %v\n", i+1, record)
+			continue
+		}
+		fmt.Printf("DefinitionID: %s, Powertrain: %s\n", definitionID, powertrain)
+
+		deviceDefinition, manufID, err := onChainSvc.GetDefinitionByID(ctx, definitionID)
+		if err != nil {
+			fmt.Printf("%s: Error getting device definition: %v\n", definitionID, err)
+			continue
+		}
+
+		manufName, err := onChainSvc.GetManufacturerNameByID(ctx, manufID)
+		if err != nil {
+			fmt.Printf("%s: Error getting manufacturer name: %v\n", manufID, err)
+			continue
+		}
+		set := false
+		for i2, attribute := range deviceDefinition.Metadata.DeviceAttributes {
+			if attribute.Name == common.PowerTrainType {
+				deviceDefinition.Metadata.DeviceAttributes[i2].Value = powertrain
+				set = true
+				break
+			}
+		}
+		if !set {
+			deviceDefinition.Metadata.DeviceAttributes = append(deviceDefinition.Metadata.DeviceAttributes, models.DeviceTypeAttribute{
+				Name:  common.PowerTrainType,
+				Value: powertrain,
+			})
+		}
+		md, _ := json.Marshal(deviceDefinition.Metadata)
+
+		update, err := onChainSvc.Update(ctx, manufName, contracts.DeviceDefinitionUpdateInput{
+			Id:         deviceDefinition.ID,
+			Metadata:   string(md),
+			Ksuid:      deviceDefinition.KSUID,
+			DeviceType: deviceDefinition.DeviceType,
+			ImageURI:   deviceDefinition.ImageURI,
+		})
+		if err != nil {
+			fmt.Printf("%s: Error updating device definition: %v\n", definitionID, err)
+			return subcommands.ExitFailure
+		}
+		fmt.Printf("%s: Updated device definition trx id: %s\n", definitionID, *update)
+	}
+
+	return subcommands.ExitSuccess
+}
diff --git a/cmd/device-definitions-api/main.go b/cmd/device-definitions-api/main.go
index 498ccb4d..bdf487fa 100644
--- a/cmd/device-definitions-api/main.go
+++ b/cmd/device-definitions-api/main.go
@@ -53,6 +53,7 @@ func main() {
 	subcommands.Register(&syncDeviceDefinitionSearchCmd{logger: logger, settings: settings, sender: sigSender}, "")
 	subcommands.Register(&deleteDefinition{logger: logger, settings: settings}, "")
 	subcommands.Register(&syncR1CompatibiltyCmd{logger: logger, settings: settings}, "")
+	subcommands.Register(&bulkUpdatePowertrain{logger: logger, settings: settings, sender: sigSender}, "")
 
 	if len(os.Args) == 1 {
 		// Run API & everythying else