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Make the following change in core/xpdo/xpdo.class.php, starting at line 2952
Replace:

try {
    $this->pdo= new PDO($this->config['dsn'], $this->config['username'], $this->config['password'], $this->config['driverOptions']);
    $errorCode= $this->pdo->errorCode();
} catch (PDOException $xe) {
    $this->log(xPDO::LOG_LEVEL_ERROR, $xe->getMessage(), '', __METHOD__, __FILE__, __LINE__);
    return false;
} catch (Exception $e) {
    $this->log(xPDO::LOG_LEVEL_ERROR, $e->getMessage(), '', __METHOD__, __FILE__, __LINE__);
    return false;
}

with:

$PDOClass = $this->xpdo->getOption('pdo_class');
if (empty($PDOClass)){
    $PDOClassname = 'PDO';
}else{
    $this->xpdo->loadClass($PDOClass, MODX_BASE_PATH, true);
    $pos= strrpos($PDOClass, '.');
    if ($pos === false) {
        $PDOClassname = $PDOClass;
    } else {
        $PDOClassname = substr($PDOClass, $pos +1);
    }
}
try {
    $this->pdo= new $PDOClassname($this->config['dsn'], $this->config['username'], $this->config['password'], $this->config['driverOptions']);
} catch (PDOException $xe) {
    $this->xpdo->log(xPDO::LOG_LEVEL_ERROR, $xe->getMessage(), '', __METHOD__, __FILE__, __LINE__);
    return false;
} catch (Exception $e) {
    $this->xpdo->log(xPDO::LOG_LEVEL_ERROR, $e->getMessage(), '', __METHOD__, __FILE__, __LINE__);
    return false;
}