diff --git a/lib/Doctrine/DBAL/Driver/AbstractPostgreSQLDriver.php b/lib/Doctrine/DBAL/Driver/AbstractPostgreSQLDriver.php
index 9e293298133..1a33b6609fe 100644
--- a/lib/Doctrine/DBAL/Driver/AbstractPostgreSQLDriver.php
+++ b/lib/Doctrine/DBAL/Driver/AbstractPostgreSQLDriver.php
@@ -31,7 +31,9 @@ abstract class AbstractPostgreSQLDriver implements Driver, ExceptionConverterDri
      */
     public function convertException($message, DriverException $exception)
     {
-        switch ($exception->getSQLState()) {
+        $sqlState = $exception->getSQLState();
+
+        switch ($sqlState) {
             case '40001':
             case '40P01':
                 return new Exception\DeadlockException($message, $exception);
@@ -69,9 +71,13 @@ public function convertException($message, DriverException $exception)
             case '42P07':
                 return new Exception\TableExistsException($message, $exception);
 
+            case '08006':
+                return new Exception\ConnectionException($message, $exception);
+
             case '7':
-                // In some case (mainly connection errors) the PDO exception does not provide a SQLSTATE via its code.
-                // The exception code is always set to 7 here.
+                // Prior to fixing https://bugs.php.net/bug.php?id=64705 (PHP 7.3.22 and PHP 7.4.10),
+                // in some cases (mainly connection errors) the PDO exception wouldn't provide a SQLSTATE via its code.
+                // The exception code would be always set to 7 here.
                 // We have to match against the SQLSTATE in the error message in these cases.
                 if (strpos($exception->getMessage(), 'SQLSTATE[08006]') !== false) {
                     return new Exception\ConnectionException($message, $exception);