diff --git a/core/txpool/txpool.go b/core/txpool/txpool.go
index be7435247d..42e42cf9d2 100644
--- a/core/txpool/txpool.go
+++ b/core/txpool/txpool.go
@@ -341,7 +341,7 @@ func (p *TxPool) Add(txs []*types.Transaction, local bool, sync bool) []error {
 	for i, split := range splits {
 		// If the transaction was rejected by all subpools, mark it unsupported
 		if split == -1 {
-			errs[i] = core.ErrTxTypeNotSupported
+			errs[i] = fmt.Errorf("%w (type %d)", core.ErrTxTypeNotSupported, txs[i].Type())
 			continue
 		}
 		// Find which subpool handled it and pull in the corresponding error
diff --git a/core/txpool/validation.go b/core/txpool/validation.go
index 7fd5f8bc79..125c0b090e 100644
--- a/core/txpool/validation.go
+++ b/core/txpool/validation.go
@@ -99,7 +99,7 @@ func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types
 	}
 	// Make sure the transaction is signed properly
 	if _, err := types.Sender(signer, tx); err != nil {
-		return ErrInvalidSender
+		return fmt.Errorf("%w: %w", ErrInvalidSender, err)
 	}
 	// Ensure the transaction has more gas than the bare minimum needed to cover
 	// the transaction metadata